I am interested to see the paperwork involved in signing it off... if indeed it was actually done
I'm also not sure whether there is any 'gas tightness' test carried out in the signing off process.
The joints were clearly not made competently in the first place, due to the mis-match between pipe sizes, necessitating the over tightening of the jubilee clips. This can clearly be seen by the clip 'biting into' the pipe. This has 2 consequences: eventually the pipe will split and it is very hard to form a seal in the first place, as the clip does not make a circular shape when over-tightened.
The basic checks for this type of joint that we look for on a BSS is here:
All LPG hose connections:
must be accessible for inspection; and,
must be part of pre-assembled lengths of hose of proprietary
manufacture (high- and low-pressure applications); or use suitable
nozzles secured by crimped or worm-drive clips (low-pressure
applications only); and,
must not be made using hose clamps fixed by spring tension; and,
must be free of any missing components, cracks, burrs or rough
edges or signs of other damage or deterioration; and,
must not be so narrow as to cut into the hose; and,
where made with crimped or worm-drive clamps, the clamps must be
suitably sized, that is, not so oversized that the band forms an
elliptical shape, or so undersized that inadequate compression is
be appropriately tight, that is, not so loose that the connection can be
pulled forward or back under light manual force nor so tight that the
hose is excessively pinched
If it looks like the excuse of 'it was OK when it left' is going to be used and there's no comeback, then some naming and shaming is in order, including a nice video (if poss) of the worst gas leak I've seen.