As a regular traveller on this route I can confirm:
flies daily 767 LHR
. This is the short-haul version. GB
flies --3-5-7 LGW
-PFO with a 32S (usually 320, occasionally 321) and --3---7 MAN
-PFO again with a 32S.
Summer 05, in addition to the daily 767 at 8:50 there was an evening flight on -2-4567 with 32S, always a 320 as far as I could tell. This was definitely mainline. GB LGW
-PFO flights were daily, often with a 321 and MAN
-PFO were 3 weekly
For summer 06 crosswind is correct that those are the schedules at the moment. But last year's evening flights didn't get loaded until January or February last year so things might change again.
In the past BA
did use 757s extensively on the route (as late as 03 or 02). In the mid 90s a 3-time weekly 777 was used as a stop-over to the then mainline operated THR flight but this flight only lasted a few seasons. I suspect BA
might have been testing the Cyprus market's appetite for the long haul product.