Storage is allowed for a certain limit. The regulations says the can has to be marked as flammable. If they are selling unmarked ones, that seems to suggest marking isn't a legal requirement. But google says different:If you are talking about plastic ones I always thought it was a colour code. Green for petrol. Black for diesel. But I think both are only intended for emergency use not storage.

The words "PETROL" and "HIGHLY FLAMMABLE".
What about house insurance invalidation etc? Do tell.what with house insurance invalidation etc.

if your plastic petrol can bursts into flames (and does not melt in the intense fire) and does not have the wording "Petrol- highly Flammable" written on.....What about house insurance invalidation etc? Do tell.
I store my petrol in bin liners and carrier bags.if your plastic petrol can bursts into flames (and does not melt in the intense fire) and does not have the wording "Petrol- highly Flammable" written on.....

Using illegal container would invalidate.What about house insurance invalidation etc? Do tell.
Show me where it says that on your insurance policy.Using illegal container would invalidate.
Maybe they are not petrol cans.I am getting a petrol can and seeing plenty for sale that have no labels on them. I think it's a requirement for labelling/marking. Can anyone explain why non-compliant cans are allowed to be sold?
Maybe they are.Maybe they are not petrol cans.
The marked one is cheaper .I was trying to save £2 on an unmarked one, but splashed out for a marked one. It doesn't matter if it leaked, I am sure I can find a way to fix it with a tpu print. I just don't need any hassle with the regulation bull ox, what with house insurance invalidation etc.