I am about to do some jobs in my Mothers house which is plumbed in 1/2" copper. Are 1/2" to 15mm adaptors still available? A blow lamp could be difficult in some places so compression would be favourite.
The opposite applys for 3/4" as well by using a 22mm compression, with a 3/4" olive.
I know they are available as I stocked up on 1/2" and 3/4" solder couplings and 3/4" olives only a few weeks ago. I wondered if they could still be got as I haven't used any for a couple of years. Then came across two jobs in as many weeks.
I prefer to use long established independent merchants as I believe they are more likely to stock obscure parts than the national chains.