Don't know if that's a recent thing, but I was in that position a couple of years ago and managed to have the "overhang" credited against my renewal quota. It was done in notes on my account.
Originally Posted by Dave_C
...If you're on for example 580tp, and you take a first class segment (for 180 points), that will take you to 760tp. This will then be reset to zero. You effectively "lose" 160 points. This is the way the programme works, and no amound of complaining to BA will get them recredited...