A bit of digging turned up the attached picture, with Gordon Farley in the saddle. The DVLA website records it as a 1962 3TA while further research reveals it starting life as a 1962 T100C, but was fitted with a 350cc engine later on.
105 CWD won four ISDT golds in the 1960s and the machine is now in a private collection – though not David Beckham’s. Watch the video at www.haigclub.com