I have an unused set of Mintex MDB1752 fronts (Martyn what is the issue with yours? I cannot see anything untoward on these, they have the slot for the wear sensor to press into), the seal is broken but I didn't use them as I stuck with the yellow stuff I had when the Mintex did not perform well on the track (MAF).
I likewise have a set of unused (sealed) Ferodo FDB451 rear pads; I also kept the yellow stuff on the rears...
Anyone wanting these I can bring to Ace or drop off in passing, happy to do them at cost or make an offer.