Gas Cylinders

open the valve and run !!!!

 

 

only joking

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You could also look on the Calor Gas web site for storage advice eg "How to store Calor Gas cylinders."

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DD, industry shares your concerns, employing this solution. https://en.m.wikipedia.org/wiki/Gas_flare

As the OP tells us that he has a caravan “gas locker” then he could use a gas ring to perform a similar function to a flare stack. Burnt gas is less harmful to the atmosphere than gas in its natural state. We acquired an old gas bottle, as a spare for our BBQ and did exactly as you say, exchanged it for a full one, which is stored in the dry in our shed waiting to be used. But the OP doesn’t want to use theirs.

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Corners, you are confused because you don’t check your facts before posting. I posted the advice to “empty them” which you have translated as  “vent them to the atmosphere” and then got yourself all worked up about something which is a creation of your own imagination. 

I wonder what the OP, who admitted knowing nothing about bottled gas, made of  "…why not empty them?…"  as to the unwary it created the impression of simply opening the valve. 

The poor chap only wanted to know the best way of storing the cylinders through winter.