I have just been fixing a leak where copper pipe was joined to plastic
(polyplumb barrier pipe). For various reasons I chose to use a plastic
coupling. Is the copper pipe/plastic coupling satisfactory long term? It
is working fine as I write but soon it will be buried under the bathroom
floor and everything re-decorated I don't want to have to rip it all out
again.
(I am aware that I could have used a copper coupling and a metal insert in
the plastic pipe I just wonder if I "should" have done it that way round.)

Frank
the tentative plumber