OP returning….
Thanks all for the advice. I think I’ll do what was suggested, and keep my fingers crossed for an AUP on the DUB-LHR leg. Fortunately I’m positioning the evening before, so will have plenty of time to ask for this in person at the airport, rather than trust to the vaguaries of ba.com.
And if that fails, looks like it will be another TP run (prob something like LCY-EDI, which I’ve done previously). I’ll do that in April, to ensure it gets counted again during my “transition period” when we all align our TP year ends. By good fortune, I had already booked LHR-DFW-LHR in FIRST during April, which should net me 840 TP - thanks to double TP from BAH 😀.