Thanks for all your advice.

Rightly or wrongly, my rescheduled transatlantic leg was rebooked into P class so I think there is a risk that BA's computer might see HNL-LAX-LHR as one flight (my HNL-LAX is also booked into P class). Plugging HNL-LHR into the TP calculator, it does show 240TPs and given there is no change in cabin, my concern is that BA will award the lower TPs. So, I've played it safe and rebooked myself onto a transcon flight to JFK before catching a TATL flight!

One thing I'd mentioned, rebooking my flights with AA was painful. I spent 1.5 hours on the phone with a very rude and unhelpful agent (the agent actually harrumphed at me at one point, which took me aback). The agent kept booking flights which I didn't ask for even though I gave specific flight numbers but I got there in the end.

@craigthemif - yes, I wouldn't want to be kicking myself if I ever get within shouting distance of Lifetime Gold!