Typically 3–10p per mile. Check your agreement — it will be stated clearly.
PCP (Personal Contract Purchase) splits your finance into three parts: an upfront deposit, fixed monthly payments, and a final optional balloon payment called the GMFV. Because you're only financing the car's depreciation — not its full value — monthly payments are lower than a traditional loan. HP (Hire Purchase) works differently: you borrow the full car price minus your deposit, pay it off in equal monthly instalments, and own the car outright at the end with no final payment required.