You dont neccisarily have to declare yourself bankrupt. Do you have any equity in the property? Would you like to avoid bankruptcy?
If you can answer yes to these 2 questions then it may be possible to bail yourself out of this and remain in the property, although as a tenant rather than an owner. In my opinion, that is a far better option than becoming bankrupt though, as this will destroy your credit rating and could even destroy your career, depending on what you do.
For more information, there is lots of info at
http://www.webuynationwide.co.uk/repossession. html
I wish you the best of luck in whatever you choose to do.
Sally