I need to remove my old kitchen sink and move some of the pipe work.
Will I have to drain the hole system to do this ? (I think I have a Y
Plan system) If not what do I need to do to stop the water?

I will also a some point soon need to move a rad and pipework will I
have to drain down for this?

Have not done much work on CH so easy to follow instructions would be great.

Thanks

Paul