There are flights going for 788 peso's from Bangkok/Kuala Lumpur to Cebu with Cebu Pacific if you book now and travel before the end of May.

All you need to do is find a flight from the UK to either of these two places. I'd imagine it would work out much cheaper than searching for flights from UK to Cebu.

And it's best to book early as you can in my experience.

Actually I've had a quick look for May. Heathrow to Bangkok £515 with Air India or £531 with Qatar Airways.
Oman Air & Emirates around £550 are just some of the prices I've seen.

Might be worthwhile if the connections match up fairly well.