Obscure wall tiles.

Hi all,
I'm hoping someone can suggest a supplier of wall tiles.
I have replaced my kitchen (learn from my mistake, avoid Kitchens Direct like the plague) and the previous house-owners had the kitchen tiled in a white, slightly irregularly faced tile. Of course, there are now gaps where I need to retile, but trying to find a source of these tiles is nigh-on impossible.
They are not standard 100mm square but seem to be 98mm, they are also quite thick, something like 9mm at the thickest point!
I bought what I thought was right from B&Q but when offered up, the new ones are not quite pure white and are about a third the thickness of the old ones.
I hope this rings a bell with someone because this is driving me mad; where the Hell did these people get these tiles from??
I may have to strip all the remaining tiles and get someone in to replaster so I can just paint it have done, and that's not a job/expense I fancy at this stage!!
Fingers crossed!
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