Yes, to further Brendan's point, if you have PPR and BTL debt, you should double the PPR interest rate and compare to the BTL to determine which is the most expensive and which should be paid off first.
For example, a 2.9% PPR is like a 5.8% BTL. So if your BTL is less than 5.8%, then it makes sense to prioritize your PPR debt.
However, if you happen to have a 1.95% PPR. a BTL above 3.9% is costing you more and should be paid down first.
All that said, make sure it is profitable in the first place. There are so many instances on AAM where people do not understand how carrying additional PPR debt because you have a BTL can actually cost you money. Total equity in both properties and interest rates are key to determining if you should have a BTL at all