Another possible candidate for the mystery flight was a TUI B738, also inbound to BHX (from Paphos) about 10 minutes behind the THY on pretty much the same track.
Oh well, here's hoping next time! 4 of them currently tooling around Gloucestershire at 10,000ft at 16.40pm if anyone lives that way and the clouds are friendly.
Out of interest has the BOAC 747 been sent off to the scrapper, or is it being kept alive a bit longer ?