Thanks for your input. I apologise for not saying hello as a new member.
I absolutely admire the quality of work of many of you that have posted pictures of your work here. It's on that basis that I got in a full-time tiler in to do the job and not tried to bodge anything myself!
I should say we got 3 quotes, from £600-800. The bloke that wanted £800 was a right pain and wouldn't leave, the dog hated him as well. A couple of indie tile shops said we should be paying around £150 a day, all tilers that quoted said it would be 3-4 days work so I imagined this is the going rate. The guy that did the work was available in a couple of weeks, the others were busy for a month. He was also recommended by an electrician we had in earlier and had cards in the indie tile shops.
He said after he started that the floor wasn't even, so to put the tiles down in the pattern we wanted, he had to latex it. I'm not sure how the tiles being turned 45degrees requires a 'flatter' floor (doesn't the 10mm of adhesive allow for this?), but when he then added £120 at the end for what is £20 of material and half-hour work... I probably would have chinned him there and then if he weren't in his 60s.
We have some screw-less socket and switches, it's difficult to see on the pictures but as he left so much grout around the white back-plates that the little clips that secure the front plate to the plastic back of the sockets didn't fit. I spent a few hours trying to gently take the excessive grout off, on some it worked, on others it didn't as the tiles around the sockets are unevenly mounted.
I'm sorry - it's carthartic to complain. I don't want to have a go at good tradesmen, but your opinion either vindicates my rage or excuses him.
For those that want more pictures, here you go. The wall tiles are in 4 colours, have a distressed edge and are all 100mm x 100mm if that helps with scale:
The floor is self is OK, there are points where the one tile is about 2-3mm lower or higher than the others around it... not what I would expect if he made the floor nice and even, but in some ways adds to the rustic look of the tile (even though they too are flat with a distressed edge).