In an earlier contribution to this discussion,
Redeye wrote:


i'd quite like to understand why this joint has failed so
spectacularly before i go trying to fix it.

As others have said, it wasn't done up properly - and don't use PTFE tape!

If you're not sure when it's tight enough - and you get used to the 'feel'
when you've done a few - do it up and then take it apart again and check
that the olive is firmly crimped onto the pipe. If you want a belt and
braces job, smear a bit of Boss White (not PTFE tape) round the olive before
you re-assemble it - but that shouldn't be necessary on a new fitting with
new pipe.
--
Cheers,
Roger
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