Sir Arthur Conan Doyle was fined £5
From The Arthur Conan Doyle Encyclopedia
This short news was published in The Leeds Mercury on 10 june 1905.
Article

(10 june 1905, weekly supplement p. 2)
Sir Arthur Conan Doyle was fined £5 on Saturday at Guildford for driving a motor-car on the Portsmouth-road at a speed exceeding twenty miles an hour.