There don't seem to be any.
I vaguely remember that someone once posted an article about compatibility
of metric adapters etc. with old imperial pipe sizes, but it would be
nice to see some mention of it in diyfaq.org.uk
Especially as I just discovered that you can't make a decent solder
joint from copper pipe diameter somewhere about 20mm (so presumably
3/4" nominal) to a temporary 22mm stop end.
But with a good deal of tightening force, a 22mm compression stop end
managed to withstand mains water pressure.
I had what I thought I needed in the way of solder ring and end feed
couplings, adaptors, etc. but panic set in when I realised I couldn't
get a proper seal to them.
I don't often thank God for B&Q but I did yesterday.
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