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I thought you were going to get a professional to do the tiles?
When you say retrospectively remedied I take it you mean without tearing them off the wall? Errr no.
Can they be taken of the wall and put back up? Possibly but I guarantee that you'll fuck at least one of the mosaics and maybe some of the other tiles taking them off. Add to that cleaning the muck off the back will be a pain in the hole and there's even greater scope for fucking a tile up there.
If this was done by a "pro" I'd be witholding payment until he made good at his own cost. At the end of the day he should have checked this first and allowed a larger grout line in the mosaic at the very least (this would still be noticeable but less so than what's there). What he should have done is pointed it out so you could return the mosaics and then help you source and appropriate replacement.
You could always try and style it out, if anyone sees it and asks look at the ground and mumble "errrr it's a design statement".
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Only a couple of packs and can't source more.
Mrs' suggestion (now we are where we are) which is better than mine is that we have a horizontal row of three mosaics (one of each colour) covering each join with the centre point obviously being the grey tile grout lines either side - as below. I wonder if this is the best of a bad bunch suggestion.
Can this misalignment of the mosaics be retrospectively remedied? (300mm obviously isn't always 300mm)