Jay Trip,
They (First Choice) pulled out a few months ago because they weren't filling flights to this destination and because of the merger with Thomsonfly and a reduction in capacity.
woodward,
I hope you manage to get things re-arranged and have a wonderful wedding. I would push them to make a final decision as the last thing you need is to have to re-arrange things at the last minute. You aren't the only one this has happened to recently; other members on here have reported the same thing. There are other airlines you can travel with from London (Sri Lankan Airlines via Heathrow) that they might be able to sort out for you.
Darren