Admittedly I'm not in Scotland but in the summer, I just get wet as it's far too hot with anything waterproof on. If the wind's a bit chilly, then I might put my
Altura gilet on (purely for the extra layer to keep warm). Spring and autumn rain depends on the temperature and I've got a windproof that does nicely for light showers (same idea as with the gilet in summer - just for the layer). I've also got one of those hideous boil in a bag "pacamac" things that doesn't take up too much room so is convenient to take with me as a "just in case" jacket for short but sharp downpours.
Winter rain, however, is the problem as that's when I get wet and cold, which isn't just miserable, also sets off my body's over-sensitive defence mechanism (aka Reynaud's). I've got an Altura waterproof jacket that doesn't let any moisture in (or out: it's definitely a cold weather jacket) and a Mountain Warehouse one that's not as waterproof but is significantly more breathable.
Still thinking about winter, I've also got Altura waterproof gloves (brilliant) and some shoe covers that work for a few hours but their main role is to keep the wind off.
As I said, I embrace the rain in summer (or at least put up with it) as it never takes too long to dry out and only gets cold if everyone else you're with insists on stopping to shelter under a tree (I lost all the circulation in all my fingers, thumbs and toes. In August. Still not forgiven them.) Just keep moving.