Most clubs have an air bottle which members, (or visitors,) can use for a small fee. This might help to keep the cost of a PCP down. A good springer is about £250, a PCP, about £300-350. Gas rams tend to cost more than springers.
Visit a club and see what people are using, and "try before you buy."
Don't forget, a good scope is just as important as the rifle. To see where your pellets are hitting at longer ranges, you need something that will give you about 10 to 12X mag.
Gus
The ox is slow, but the earth is patient.