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Originally Posted by Happyman  Those HSL warning signs are - I am pretty certain - for the UPVCE test site which is somewhere up that way 
UPVCE you ask ?
Stands for Unconfined Percussive Vapour Cloud Explosion.
Set up when UK went over to natural gas and the HSL and the gas people had to define safety limits for a cloud of gas being released and hitting an ignition source .
This set the spacing between process units in a distribution centre .
Through my insurance work I saw a HSL film showing these tests - BLOODY SPECTACULAR !!!
Ka-bloody-boom ! 
Now used by the petrochem industry |
Thanks Happyman.
Interesting information.
Many years ago when I was involved in the Petroleum Industry. We were doing various research into LPG (Liquid Petroleum Gas) this was with regards to safety aspects relating to retailing the same from public places. ie Petrol Stations.
Have you ever seen that stuff go up?
We witnessed a demonstration of a mug-full of the stuff being thrown into a source of ignition.
Wow!!!
However, the same is retailed throughout the world in general nowadays, the safety aspects appear to be good.
Of course it has been retailed as Calor Gas, or Bottled Gas in General for many decades,
Unless of course you know different.
I am vaguely aware of a major disaster and explosion about twenty years or so back at a Camp Site in France.
Do you know what happened there?
I think a tanker load of the stuff overturned down an embankment and burst.
Curious.