Some nice photos of the event in London here and another Mini taking part:-
https://www.flickr.com/photos/anton4...n/photostream/
Registration number: XJB 308H
✓ SORN
✗ No MOT Expired: 21 March 2013
Vehicle details
Vehicle make
LEYLAND CARS
Date of first registration
01 April 1970
Year of manufacture
1970
Cylinder capacity (cc)
1293 cc
Export marker
No
Vehicle status
SORN in place
Vehicle colour
RED