Front brake pads changed to EBC HH pads, bit of fighting and swearing at the pad retaining pins (they're a little flat spotted where the pads rest, and corroded). Pushed the pistons out a bit more to clean off the corrosion, and also old brake dust and crap in the caliper and on the springs. Cleaned the old grease out of the rubbers and new silicone grease in, cleaned up and greased the slide pin and the retaining pins with a very thin layer of lithium grease too to ward off any corrosion.
I am definitely missing the shims off the brake pads, so they're also on the shopping list. They'll have to come from Japan, because there is no way I'm paying £20 per shim for the big one (Japan has them at £2ish each, shipping at £16, so for the cost of one side I get both).
Put back together for the time being, they don't squeal at walking speed, and due to go out later on for the true test! Also nb: wear sun cream, the sun is hot, I may or may not have got burned doing this job