I'm a little fuzzy on the conversions so correct me if I'm wrong. Assuming you get a good pour at a pub around the village in a pint glass with no head that fills the glass to the tippy top you have 16oz. That's not uncommon either to have my glass filled to the brim with no foam. So with imperial pints you have 1.2 to every US pint right so it equals out to 19.2oz (US) pour assuming no head? Not 16 and 13. Unless of course the pour sucks and is taking up 20% of your beer with head. And they would have to fill an imperial pint glass to the brim as well.
Proper pints are a full 20oz. 568ml, according to what was written on the side of the milk bottles delivered every morning (some time ago, admittedly - but it probably hasn't changed).
Plenty of bars serving 'mini-pints' for higher abv beer. My local, Six Feet Under is particularly bad at this practice now. Quite the rip off, it is.
Others mentioned Sweetwater IPA being a good go-to tap. I agree 100%. A much underrated beer. Probably our best true local. Personally, I think Terrapin is a better brewery. Although, they do come up with some daft concoctions from time to time.
Looking forward to trying out Elder Tree.