Also try John Charcoal, they are big.
As usual in the UK, there's tons of ways to get ripped off. Mortgage advisors recommended by real estate agents will rip you off, mortgage advisors will only tell you about offers that include a giant kick back for them, etcetera, etcetera. Do your research.
When I was in a similar position to you, we got a mortgage with a higher rate for the first few years, then later changed to a bank.