I can't remember how long London were based at Barnet Copthall and, while it was not the most salubrious of settings, I do remember seeing a wonderfully vibrant side there on a number of occasions. (Can someone remind me of the wonderful little Kiwi? scrum-half who seemed to be man-of-the-match on a regular basis)? I do remember Abi Ekoku beginning to make an impression before he was signed by Bradford. And it was Tony "Tank" Gordon as coach, wasn't it?
It is salutary to remember that, in those days, Saracens were playing on a public park!
Mark Riley was that scrum-half.
Went to Swinton after Broncos pushed out the Kiwi contingent.
Copthall might be great for coming down from the M1/A1 as per the OP, but it's an awful place to get to by public transport for the home support. 20 minutes + from the Mil Hill East spur of the Northern Line. Parking isn't too good either.