Just to put this one to bed finally, the tiler who did the mismatch
tile job was recommended by another local tiler who had done some work for me. Once he visited and saw the mess he offered to come and relay the other tilers work for free.
I managed to get just enough of the right batch code tiles by trawling all the local Homebase stock shelves. So with me armed with my Bosch grout removal blade which did them all with hardly any dust excaping the connected Vac cleaner and only slightly wore 1 diamond blade, and me again with my Bosch sds digging up the bad tiles, he followed behind laying the new replacement tiles.
1.5 days later its looking like it should have done originally. Of course I did give the tiler some ££ even though he was kind enough to say he would do the job for nothing.
Bet you didnt think that would be the result did you :smilewinkgrin: