Fortunately that's one problem I don't have.
It doesn't stick, but... the pipework I've pulled isn't copper and isn't magnetic either. According to the internet not all stainless steels are magnetic, so, umm, I dunno!
An update to this: I have my 22mm stopcock and copper metric/imperial olive ready, but have just scraped a patch of paint off the pipe going into the old stopcock and it looks like it's steel*. I tried a couple of compression fittings to 3/4" steel pipe before I pulled it all out and they...
I'm having trouble getting a plumber out in a reasonable timescale and I have one of those olives handy, so I'm seriously considering this and a Pegler lever valve from Screwfix.
Yes, I think I might just replace it. My instincts are that I shouldn't put pushfit before the stopcock - am I being paranoid? I have a speedfit 3/4" - 22mm adapter I could use, otherwise I'd need one of these.
As a side note I'm surprised how hard it is to get imperial fittings considering...
Thanks Chris, new one on me. In my ignorance I cut the old manipulated pipe stem to remove the fittings, so I'm a bit stuck from that point of view. I'll maybe see if a local plumber can manipulate and install a new one otherwise I guess the stopcock will have to be replaced.
I've just replaced all of the 3/4" pipework in our late 60s house, and the only thing left is the stopcock itself. It has something similar to a compression fitting, but the pipe hardly inserts into the body of the stopcock at all, and the nut is taller than usual and has a rotatable brass bush...