The Middlesex County Times & West Middlesex Gazette has tonnes of gigs listed in its coming events section at the back and I found these for Buddy Britten & The Regents. All at the Ealing Club
Wednesday, 16 September 1964
Wednesday, 23 September 1964
I also saw Delta 5 and Some Other Guys but didn't have time to jot them down.
A book called The Day Before Yesterday by Steve Ingless also has a gig at The Rhodes Centre, Bishop's Stortford on 5 September 1964