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Yeah they are, there's a few types of STM2 (?) I think, but dimensions fairly well published.
Tap sorted* now, should have done that ages ago!
*The M4 brass screw holding on the hot handle was corroded so I'll have to get a replacement.
Also had to leave the old one in place while I popped to the shops, seems the plumber that replaced my supply pipe didn't replace the gland on my stop cock like I asked him to as there's still the smallest of flow when it's shut off. Will have to get around to that at some point.
Are gas meters smaller than this in 2022? I am on the list for a smart meter