Still, it's worth mentioning the importance of getting a "mortgage in principle" before you go house hunting.
A mortgage in principle is an agreement by your lender that they will offer you a mortgage subject to certain conditions — including a successful credit check and property valuation.
Having a mortgage in principle means that:
sellers will take you more seriously, putting you in a stronger bargaining position
you're less likely to lose out if there's a race to get a certain property