I reckon this picture attached is from an edition of the BBC TV Programme 'Wheelbase' (a forerunner to 'Top Gear' ) broadcast on 28th February 1969 Lord Denbigh the 1st owner of CGU 7H was on the programme and I believe Alf Briggs of Honda UK was possibly riding the bike too.
I keep meaning to contact the BBC to see if a video copy still exists. I doubt it but worth a shot. That programme series was one of the first to be transmitted in colour .
Note that is still has the rectangular rear lamp and high bars fitted ... Lord D obviously can't have been the owner at that time as he had it changed to low bars and the bike was fitted with the UK style oval rear lamp to comply with UK regulations. I understand that Alf Briggs (then based at UK Honda's Service Department in Nottingham) took the bike to Lord D's country estate for the filming of the TV programme.