Thanks Best, that sounds like the course of action I'll be taking, the external stopcock is just outside the house. I didn't fancy messing with the lead joint especially with it being so close to ground level. Thanks everyone else.
Hello everyone. I've got to replace this stopcock as it's leaking and almost seized up. Am I likely to encounter any problems removing it and will a standard 15mm stopcock be ok as a replacement? The old lead pipe is just visible under the concrete. Thank you.