Gas bottle location ~ legal or not?

Don't forget that the spare bottle (shown in the photo) also needs to be stored in a safe, ventilated location. Often the anchor locker is suitable.
as should fuel cans
Oyster Yachts sent out a warning to owners after a fire caused by a large o/b motor tank stowed in a locker vented due to heat & ignited, they recommend the vented anchor locker for fuel ect
 
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