It's for a Briggs and Stratton lawn mower. I have no idea if you can get in the UK, I got it for 20$ on Amazon. Fits snug over the 39mm opening and perfectly under the panel. I did not have to adjust my jetting to my great surprise.
Part # on package.
DD
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------------------------------------------------------------------------------ carpe scooter diem
Had to cut the corner away a bit on mine ,where the fuel bango /pipe is , i know the hole is slightly larger than my PHBL 25 but stays in place against the panel, doesnt affect the running at all.
be switching to a Mikuni TM24 soon , hopefully it will still fit .