Redeye wrote:

5. i'd put a couple of wraps of PTFE tape over the olive as i'd been
advised that this can help stop small leaks (was this my downfall?)


IANAP
Best to remove all tape, provided the fittings are clean, unscratched
and undamaged. Tighten until the olive just grips the pipe. Add an
extra 1/6 turn to compress the olive.
No doubt proper plumbers will disagree.

john2