Thanks for getting in contact, I really appreciate it.
The garage looking at my car have said the caliper is fine, the problem is that it's the pad carriers have seized. More worringly, the wheel was only being held on by 3 bolts - one had snapped off and the other was on it's way. What on earth cause that to go? Have not long had new tyres, so could it be down to using an air gun?
Anyway, look out for the post offering a caliper for sale soon!!!