That's what I had when in London . The main residence I sold after 30 years and the buy to let ( a one bedroom flat I bought with a redundancy payout ) I sold about the same time . Bought both when prices were low and sold both when high , I was very lucky in that respect and retired at 60. The profit on the flat paid for this 3 bedroom house I'm in now .Not really.
Main residence and a buy to let.