Who Has The Best Mortgage Deals

I am a first time buyer and ive found a lovely flat for myself. However, I'm Still looking for a mortgage but i just dont know Who to go to. The Thing Is The mortgage advisor IS Saying That I cannot get a mortgage on my own, i will Have to Get It With Someone Else Which is fine but i just dont know Who to go to. I Have Tried to Nationwide far too expensive They Are Asked around and aim Who dont know .. Can anyone please recommend "any mortgage best deals? Any gold banks?