I wrote to over 150 Members of Parliment and Lords, and received 78 replies. These included letters from:

3 Prime Ministers
8 Party Leaders
5 Chancellors of the Exchequor
6 Foreign Secretaries
4 Home Secretaries
2 Speakers of the House of Commons
1 Lord Chancellor
2 European Commissioners
1 Serving Prisoner (now on probation)

From the letters (not including photographs found since) the running tally of usage is:

4 Skateboards
6 RollerSkates/Blades
2 Spacehoppers
4 Go-karts
1 Death Slide
7 Scooters
7 BMX/Bikes