Where to look for 6-month contracts

I’m looking for a 2 bed flat in the north of England (pretty flexible where) from mid-Feb but for a 6-month contract, and would like some general advice.

My assumption is that most landlords won’t accept a 6-month enquiry and that if I am successful I would be expected to pay above the list price. Is this correct?

And where is the best place to search? (Not geographically but specific web pages or whether to go through traditional agents etc).

Any information or tips would be gratefully received