Darren I know what your saying insurance company's try anything to get out of paying if anything happened ill ditch the bottle at scene if poss. Hopefully that won't happen. I may fone and tell erm I carry a bottle about occasionally thru winter. 👍
For me, I rang them & told them.
Didn't cost me a penny bud.
Call em and ask for a quote to carry gas.
If they say there's no loading (that's the terminology they'll use) just add it.
Guaranteed to be safe then bud.