We have some with homeserve at 50p pcm for the first year. Been used. next door neighbor had a bill for 800 to sort out for similar work.
The ball ache for us is the pipes are beyond life span, and need replacing but as they are shared supply, nearly impossible to arrange as no one is interested unless the leak is theirs and of course that doesn’t coincide.
We’ll be getting taken off the shared supply in due course.
I’d suggest considering it if your house is on a shared supply and your house is 40+ years old. Own supply or newer house i wouldn’t bother. (Edit – though not at £15pcm)
First repair every 24months is usually free, but that’s per main connection so 1 per shared supply.