I missed the moped race. Can't have been by much though. I believe it was part of the 25th Anniversary meeting in 1974, which was my first season. I didn't start going until August though and it must have been before that. I did buy the 25th Anniversary booklet though - a classic of its genre.
Not convinced it's Hans Wasserman. I think he was shorter than that. I still reckon, looking at old team photos, that Mick Bell is the most likely.
I've added more pictures. Can anyone guess the Oxford no 4 against Hackney, and the Oxford number 2 against Wimbledon?