I took some advice via Twitter earlier this week and ordered some new brake pads direct from Superstar Components.
Two days later, less than half the price of Shimano OEM or Ashima and with no postage costs, here they are!
I also got a bag of Haribo! Wiggle haven’t sent me any for ages, so Superstar win on that score too.
p.s. I posted this via my phone, so sorry if it looks pooey.