Yeah I'm sorry I know it's been done before but: what boots for typical English winter riding, i.e. cold wet rain, deep splashy puddles, etc rather than super cold and dry snow so performance in the wet is more important than performance in super low temps.
I have (I think) Shimano MW80s, a couple of years old now, they're ok in cold & dry but need something a notch up.
Not Fasterkatts, I tried but didn't get on with them, but something along those lines I think with some kind of extra flap page (instead of a separate neoprene overshoe) with a good seal at the leg.
I bloomin' hate cold wet feet me.