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Just borrowed a camping stove to use on site while we are off grid. Probably mostly tea and pot noodles, anyway, does anyone recognise the fitting? Presume I need a regulator and refillable bottle. Any hints as to what I might need or what is good.

Don't recognise it, could it be a quick connect to a bbq gas outlet you sometimes find on big motorhomes? There is no regulator and normally it would be on the hose, with a bbq outlet the regulator is in the van.
What make is the stove?
This place really has got really quiet, just saw this on the bottom of the first page and my post was over 10 hours ago!!! I seem to remember stuff would struggle to make 90 minutes before dropping to page 2 not so long ago!
It's the weekend. Folk are out riding 😉
Not seen a gas fitting like that before.
I suggest you check with whoever you borrowed it off