"Redeye" wrote in
oups.com:

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?)

I think it's this that did you, making you think you had a seal when you
hadn't.

You should NEVER put jollop on a compression joint (unless, unless...) but
in case of a bodge like that - old pipe, short pipe, unremoveable olive etc
you will need to muller it well down and make damn sure it won't budge

mike