In an earlier contribution to this discussion,
Gordon wrote:

are 1/2" to 15m/m and 3/4" to 22m/m copper pipe adapters available,
I have tried B&Q warehouse and Wickes without any luck.
Gordon

1/2" and 15mm pipes are so similar that you can use 15mm compression or
solder fittings on 1/2" pipe without any problems.

22mm pipe is *slightly* bigger than 3/4". You can use 22mm compression
fittings on 3/4" pipe with special olives - with a slightly smaller ID. You
can get these at a decent PM but maybe not at the sheds.

If you want to use solder fittings to join 22mm and 3/4" pipe, you need
special fittings whose two ends are a slightly different size. Again, you
can get them from a PM - or probably on-line from the likes of BES.
--
Cheers,
Set Square
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