You will need to get some valuations from local estate agents for the OR.
I suggest a local independent estate agent that will show you a realistic valuation for a "quick sale". Do not tell them you are BR - say you are thinking of relocating for work.
You will not need this for a few months - (probably three months after the BO).
The market is changing quite fast in some areas (upwards). Post back if you need some more advice, Richard