26 flights on it and afraid your sources are n't correct or somewhat pessimistic.
It was perfectly possible to stand up - at least until the wine started flowing! Wines were truly good - and they always had an 'off-list' vintage red burgundy available on request, but you had to know it was there to request. Often bought out and served with a napkin hiding the label.
Seat pitch like premium economy, so comfortable enough for 3 hours. Seat allocation was non-status and 'boat people' (cruise passengers) in the back cabin, golds, prems, regulars and full fare in front cabin. Status and regulars only in rows 1-3, where the food was hand served, rather than from (narrow) trolley for row 4 on.
Before the 'finale' flights (when the wine and food was trimmed back) it was often possible to sit in row 1-3 with the seat beside you blocked out. That way you could get an aisle seat and have the window seat empty (the Windows were like sitting by a radiator as the windows got very very hot in flight)
Boarding was straight from the lounge, so you could get on board at 5 minutes to go, and food was great, and it was like private jet when some days there were around 20-40 on board, lowest ever was 12.
downsides - small loos (makes A320NEO look generous) and tiny overhead locker s- but then the suiter service really worked and the front wardrobe had tonnes of room.
Unusual features were the Sunrise in the west in October on the westbound evening LHR-JFK as the plane started to fly faster than the earth's rotation and move back into the sunlight; a small set of crew - so after a while you to know them all; and, the stand off to be important enough to be last to board!
oh, and the morning BA2 still often had to hold in the stack to land on a JFK-LHR, whereas the lunchtime BA4 JFK-LHR was the most civilized Transatlantic timing ever - you had a full morning in NYC, a 3 hour hop at lunchtime from JFK to London and were still home in London by UK bedtime.
Sadly missed 15 years on...