@NeverDropYourMooncup ah. My understanding was:
Sh: 27, reg 29, long 31; which they changed to: Sht 29, reg 31, long 33? But now they have changed back again? I haven't bought many trousers in the last few years, so may have missed this.
FWIW DH is 6', and a 31.5" inside leg.
It would be far more helpful if they sold trousers by inch length rather than category.
Our local dry cleaner is also a tailor and does fab alterations. Don't get me on the subject of Whistles sleeve lengths, but it's £15 well spent.