Wasn't there also a GW1 Mk1 Bomb tails v Mk2 tails incident - the Muppets didn't have a weight for the Mk2 so they used the Mk 1 weight - the Mk2 weighed considerably more. I remember flying with the Captain Rick P**** who told me that they had never flown @ 155/175000lbs before and just thought it was normal.
Of course, I might be mixing stories as a lot of brain cells have died since then....