My advice to anybody that is considering getting into the residential letting business is to be
very cautious with your financial projections.
In my experience, prospective landlords invariably underestimate the costs and taxes involved in the residential letting business. It is important to be realistic and to include a suitable provision for voids/over-holding periods.
The format on this thread may be helpful in running your own projections -
https://www.askaboutmoney.com/threads/keep-apartment-as-rental-or-move-tracker.203907/
FWIW, I take the view that the RPZ regime has artificially increased rents on new rentals - because sitting tenants have a huge incentive to stay put and this restricts turnover/supply. I don't expect this to continue indefinitely.
Personally, I can't see any value in a leveraged rental business at today's yields and BTL rates. Properly accounted for, the numbers just don't work.