Interestingly:
The speed limits in Royal Parks are also intended for motor vehicles only. According to:
http://www.legislation.gov.uk/uksi/2010 ... ion/1/madeCitation, Commencement and Interpretation
1.—(1) These Regulations may be cited as The Royal Parks and Other Open Spaces (Amendment) etc. Regulations 2010 and shall come into force for the purposes of regulations 1 to 4 on 6th April 2010 and for all other purposes on 1st October 2010.
(2) In these Regulations–
“parking permit” means a permit issued by or on behalf of the Secretary of State for the parking of a vehicle;
“parking place” means a place shown on a notice exhibited by or on behalf of the Secretary of State as being appointed under these Regulations as a place where a person may park a vehicle; and
“vehicle” means a mechanically propelled vehicle intended or adapted for use on a road. .So
maybe it was purely the act of overtaking vehicles in silly places at speed which landed him in court, and the officers were there to laser cars...