You will need a substantial deposit for a BTL mortgage, and some companies will expect you to prove you have enough income to cover three months mortgage repayments should you lose your Tenant. A good independant Mortgage Broker would be my first port of call.
i can recommend a good one in Manchester. They've got a fantastic team ,they took all the worries, the hassle and the stress . They didn't leave any question unanswered and was really sopportive . https://manchestermortgages.com/ If you are in the search for excellent mortgage brokers in the Manchester area I wouldn't look any further