Yup,
Thanks what i did, I used the unibond gunk (which by the way was horrid to spread.. and now I'm waiting... I have some decent grout and to be honest I've already primed the wife that this'll need redoing at some point in the future.
For me this is kind of a big deal the only thing I've done harder than this was to plaster a wall which turned out alright in the end.
Read this forum pretty intensively before I did this and I used the maxim that quite frankly you can't go too slowly when preparing the surface, the pics don't do it justice I took every last inch of the old adhesive off then sanded down with 40 grit... all looked lovely (pointless but nice to look at for 5 mins ). So I posted here and spoke to unibond and to several other mates and they all pretty much agreed that unibond was rubbish but was what I needed to use for patching this up.
The only thing I kind of wished is it were two tiles not under constant footfall (like in the corner or something) unfortunately that wasn't the case.
Sorry if i'm rambling... oh yeah the wife is more put out than stop putting out if you get my drift 🙂