1928 North London semi. Looks like an iron elbow connecting a 1/2" lead pipe
buried in the wall (presumably original) to another length of the same
outside it:

http://www.justigator.pwp.blueyonder.../DSC01085a.jpg
http://www.justigator.pwp.blueyonder.../DSC01089a.jpg

Would like to connect to 15mm copper like the pipe on the left in the main
pic does. Don't think I can DIY a similar soldered join myself (correct me
if I'm wrong). Not critical because it connects to copper behind the washing
machine anyway and I could join there. But it would be neater to do it where
it comes out of the wall. Nut of the elbow is 1.25"across flats. Can't
discern how elbow connects to pipe in wall. Is it likely to be, or suitable
to be replaced by, one of these:

http://www.screwfix.com/app/sfd/cat/...43476&id=14890
http://www.screwfix.com/app/sfd/cat/...43530&id=17647

Or could I use one of the lead-to-copper couplers he

http://www.toolstation.com/shop/Plum...ion/d20/sd2697

and if so how can I ID which of the two gauges of 1/2"lead piping mine is?
And do they work just like compression joints on all-copper?

TIA.

rrh