Landlord issues and fixed term contract?

Basically it cash in hand, I found out that the contract used to belong to a previous tenant with the name tip ex out, that he has stated he doesn't live in the UK on paper work, he owns the house but said to me that its his brothers (a drunk), its a six month fix term tenancy, he has a £300000 mortgage and all the bills he has he put in a previous tenants name causing her to have dept.
After hearing all this I don't want to be part of it. I need to look over the contract (which is in his brothers name) but just to get out of it I will give up getting my £300 deposit back.

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