Are you renting or selling? If it's empty there won't be chain above you, so in theory it could be completed quickly. If you're renting and you have a mortgage agreed in principle, I'd offer £175-180k on the basis you can move quickly. If you have something to sell, it'll take longer so you're not in such a strong position. Looking at Zoopla, there seem to be a lot of houses on at around that price, so they have a lot of competition for your money.