Yes I logged WT871 as the first (ever) complete flight at Bovingdon after Paul was aerotowed in. I only had one flight that evening (21 Jun) but my logbook shows I had a flight with Jacko in '871 the next evening (22 Jun).
Obviously you and I were there and I think 'Wally' Wallington was there too; he 'found' a 3 tonner in MT and and also discovered where the winch had been parked in one of the hangars.
My logbook also shows '871 as back at Halton on 26 Jun so you must have flown back on 23, 24 or 25th.