In article ,
"[news]" writes:

I've 2 plumbers in the family and they rarely use copper and only in the
circumstances you and I mention. far too much faffing about, especially
when time is money, especially OPM (other peoples money)

Seems like a good reason to DIY, where time isn't money.
The heating system I installed 3 years ago is all copper,
with end-feed soldered joints. (It was last drained and
filled 2 years ago, and has not needed topping up since.)

--
Andrew Gabriel