Mintex mlb52 on eBay at less than £20 per set for standard compound. Or look at EBC site and enter your Reg number and they’ll offer a selection of compounds from standard, green, yellow and red.
Note, if they are CAPARO calipers, you may need replacement w-clips as they often disintegrate when pressed to get retaining pins out. Available from Rimmers at about £1 each. (As Dave said, Austin Princess ones!)
Note, when fitting, the pads may be a little bigger than the disc on the outside so a light chamfering on the edge of the pad may be desirable to save a shoulder building up in the future. (Not because of duff pads.This problem was there from design stage when new)
