Good point about not being able to use all that gas even if you wanted to.
I take it you only use gas for hot water and central heating, what make and size (btu) is your boiler ? I have a mate in the trade and we could probably find out what the maximum gas consumption rate is. That might be another bit of ammo for you.

I am so glad you didn’t have a leak, I heard a loud rumble earlier on from the south west but now I’ll put that down to Shoeburyness !!

Phil.