Chris Cowley wrote:
The page http://www.clubi.ie/plumbing-heating/gripes.htm states:-

"PTFE joint tape in the thread of compression fittings is a common
sign of uninformed DIY."

Where exactly is one supposed to put PTFE tape if not on the thread of
compression fittings?

Things such as radiator tails. Taper threads. Gland packing,
possibly. Not in compression fittings.