The first speed event up this fairly straight, loose macadam 1 in 5 gradient was held in 1910, and the last on 28th March 1925, and it was as the result of a mild accident to a spectator at this meeting that the RAC decided to ban all motor sport on public roads. Unfortunately as this was an open public road the public could not be restrained from going and standing where they wished, and private vehicles had to be given the right of way if they wished to drive up or down the hill.
The total length of the hill is 3,848 feet with a total rise of 304 feet, but the competitive section is 903 yards long. The banks where spectators stood too close to the speeding vehicles have now largely gone and the road is much wider and better surfaced.
In 1911 cars also started to use the hill and most meetings had classes for both cars and motorcycles. In the early events, in the motorcycle section, machines were separated into a bewildering array of classes.

Date	Commentary
1911	6th May 1911 The fastest times for the climb in each of the classes were: Experts, Class 1: lightweights up to 110 lbs, GE Stanley, 2.5hp Singer, 68.4secs. with pedal assistance, Class 2:146 lbs. to 300 lbs. G Patterson, 2.75hp New Hudson, 54.2secs., Class 3: twin cylinder 146 lbs, 343cc, H V Colver, 2.75hp Enfield 54.4secs, Class 4: single cylinder 557cc, W G McMinnies, TT Triumph, 43.8secs, Class 5: any single cylinder, W G McMinnies, TT Triumph, 44.2secs, Class 6: twin cylinder 750cc, S T Tessier, 5hp BAT, 40.8secs, Class 7: any twin cylinder, F W Barnes, 6hp Zenith Gradua, 43.2 secs. Class 8: any machine, S T Tessier, 5hp BAT, 4lsecs, Class 9: passenger machines, F W Barnes, Zenith Gradua and sidecar 64secs, Class 10: flexibility, W Pratt, 3. 5hp P&M, difference in times 111 secs. Yates 2hp Humber, fast but pedaled…J Holroyd 2 1/2hp Motosacoche, fast but pedaled…D R O'Donovan 2hp Singer pedaled hard as also did Eli Clarke (2 3/4hp Douglas) The comment in The Motor Cycle for this meeting says: The surface left a good deal to be desired, as it was extremely rough throughout the whole course and more especially near the top where there was a deep rut, which occasioned one spill and nearly accounted for several others. But for the surface, this location is nearly ideal for a competition. It is safe, almost straight, and the progress of the climb can be seen almost from start to finish.
1912	The meeting was held at nearby Aston Hill
1913	March 1913 Barnes was using an 8hp Zenith and clocked a time of 35.4 seconds to record fastest time of the day, followed by G Griffiths also on a Zenith in 38 seconds. At the August 1913 meeting there were not more than a handful of competitors, and very few more spectators to witness the ascents. There was only one exciting incident the whole afternoon, and that was when J Kennedy (8hp VS) somehow lost control of his machine and dashed full speed off the road. He and the big cream coloured twin landed in the hedge and, marvelous to relate, were not much knocked about. Fastest time of the day was made by A J Brewin in 48 seconds on an 8hp Zenith.
1914	March 1914 The competitors met at the George and Dragon Hotel in Princes Risborough. Unfortunately owing to the weather conditions the top part of the hill was rather soft and rutty, and several of the fast men wobbled dangerously just before the last steep pitch. The afternoon was marred from a spectators' point of view by the torrential rain and cold driving wind. Fastest time of the day was made by R R Coes on a 7hp Indian in 43.2 seconds.
1915 - 1919	No Racing
1920	March 1920 This meeting was the first open hill-climb held in the Home Counties since the war. Fastest time of the day went to Oppenshaw on an 8hp Zenith in the very fast time of 32.6 seconds. May 1920 This meeting was organised by the Ealing and District Motor Cycle Club as a contrast to all the other meeting which had been organised by the Essex Motor Club. Fastest time in Class A (up to 550cc) went to H le Vack on a 3 1/2hp Duzmo in 40.4 seconds. In Class B (up to 750cc) he was also quickest in 41.4 seconds and in Class C (up to 1000cc) he was also fastest in 41.4 seconds, all on the same Duzmo.
1921	April 1921 At this meeting fastest time went to T C de la Hay's Sunbeam 3 1/2 hp in 30.4 seconds followed by H le Vack's 7.9 hp Indian in 32.4 seconds.
1922	March 1922 A large entry did not materialise, but some exceptionally fine climbs were made, and the star ascent of the afternoon was Kaye Don on a 7.9hp Indian at a speed slightly over 70mph, in 26 seconds! Second was T C de la Hay on a 3 1/2hp Sunbeam in 28.2 seconds and third G J Read (8hp Enfield) in 28.8 seconds. May 1922 This meeting was run by South Midlands Centre and had a record attendance and fine weather. Competitors had to wear TT helmets and this saved one unfortunate rider who fell off from severe injury. Problems were caused by thoughtless spectators wandered on the course and obstructed the riders' views of the road. George Dance was outstanding with a time of 28.2 seconds on his 492cc Sunbeam and made fastest time of the day. October 1922 This meeting was also run by the South Midlands Centre and in spite of a wintry wind that swept the bleak face of Kop Hill a goodly crowd of spectators turned out. The timekeeper located himself on a far-away knoll whence he could see the starting and finishing lines and the Heath Robinsonian string operated signal arms thereon. The timing could not have been accurate to the tenths of seconds employed but probably the error factor was constant. Fastest time of the day went to H H Saddington on a 662cc James in 30.4 seconds.
1923	March 1923 At this event, organised by the Essex MC, 0 M Baldwin riding a 994 Matchless-MAG made fastest time of the day with an average speed of 72.6mph and a time of 25.4 seconds. A Goyder-Smith, a one legged ex-naval man, on a 490cc Norton and sidecar performed very well with a time of 37.2 seconds! J A Welch on a 349cc AJS made a meteoric ascent in 30 seconds but sat up suddenly as he crossed the line, lost control, and finished up in the hedge, fortunately without serious injury. F G Hicks on a similar machine also suffered at the hands of fate, running over a dog but preserving his balance.
1924	March 1924 This meeting which was held in a biting north easterly wind, the Essex Motor Club was criticised for a programme which made it utterly impossible to follow the progress of the various classes. The riders were sent up one after another in batches comprising several classes, thus the first group consisted of twenty riders from nine classes. Fastest time of the day was made by Freddy Dixon on a 997cc Harley Davidson in 31.4 seconds, slowest time of the day was by T G Meeten on a 147cc Francis Barnett in 73 seconds. October 1924 This meeting was run in brilliant sunshine. Freddy Dixon again made f.t.d. with 24.8 seconds on his 997cc Harley Davidson and in another class Freddy did 25.8 seconds on a 594cc Douglas, 25.6 seconds on a 494cc Douglas and 28 seconds in the sidecar class!
1925	By the start of 1925 concern was growing over the risk of accidents to spectators at public road events, and a recent court case where an onlooker injured by a competing motorcyclist had been awarded damages, was a worrying precedent. Public road speed events had already been banned in Worcestershire, Warwickshire and Staffordshire, but a solution seemed to be at hand. A bill was in preparation to go before Parliament to permit the closing of public roads for motor competitions, in the same manner as had been done in Northern Ireland and Isle of Man. March 1925 At this meeting there was a particularly large crowd who obstinately, and often rudely, refused to obey marshals' instructions to retire to safer vantage points. They were particularly thick, in both senses, at the very fast top right hand bend of the hill. J T A Temple on a stripped Norton stopped half way up the hill but was immediately followed by T R Allchin on a 998cc Zenith-Blackburne who came up very fast but appeared to be worried by a group of spectators assembled around Temple's machine on the bend. He took the right hand curve extremely close, shot across the road on to the grass, and, after jumping a deep gully and hitting a bush, crashed on the left bank, fortunately without hitting any spectators. He was reported to have a broken wrist, concussion and bruises. Fastest time of the day went to Freddy Dixon in 22.8 seconds on a 736cc Douglas and the same bike fitted with a sidecar only took 2 seconds longer. Raymond Mays had sold his two Brescia Bugattis, Cordon Rouge and Cordon Bleu, to raise funds for another project. Cordon Bleu was bought by Francis Giveen, a Cambridge undergraduate, who did not inspire confidence. He had already had one testing accident and seemed to have very little awareness of the limits and dangers of this very fast car. A wild climb by Giveen clocked 31.2 seconds but he seemed totally unaware of the havoc he had created along the way. He had shot off the road on the last right hander, bounced along the track, and back onto the road again, without pause. Unfortunately he struck a spectator during the excursion, breaking one of his legs. Fortunately, by the time of Giveen' s run the crowd had thinned considerably, otherwise the accident could have had even more serious results. The injured spectator had been one of those who had been asked to move several times during the meeting but had ignored the exhortations of the marshals, so really he only had himself to blame. But at this point and with several more runs to take place the RAC steward stepped in and stopped the meeting. A week later a statement was issued by the Auto-Cycle Union; Following the decision of the Competitions Committee of the RAC declining to grant permits for any high speed contests on the public highway, the Competitions Committee of the A-CU has passed the following resolution: 'That this Committee having carefully considered the difficulty of ensuring the safety of the public at motorcycle speed competitions on the public highway, involving an excess of the legal limit of speed, is of opinion that until the conditions are changed all such competitions, whether 'open or closed', are prejudicial to the interests of the sport.' And that was the end of Kop Hill as a speed event, as well as all speed events on public roads.