Hi Tinkerbell
I have had a chat with my official receiver friend and they have said that there should be absolutely no problem for you to declare bankruptcy without affecting your partner's property in any way. If you have lived there for just two and a half years and simply made contributions to the household bills then there should be no issue at all.
When you speak to the official receiver, they will probably want to ask you about the property but given that it was your partner's long before you met or moved in and you have not paid for any improvements or towards the mortgage, there will be no question of you having any interest in it.
In the light of this and from what you have said about your circumstances, I think bankruptcy is the right solution for you.
Good luck for next Tuesday and let us know how it goes.