No worries, fitzer:
Section 35 of the Sale of Goods Act 1893 amended slightly in the 1980's act.
If you've access to a Law Library (at a University etc.) check out pg. 299 of Commercial Law by Fidelma White.
She mentions a case: Mechan & Sons Ltd. v. Bow, M'Lachlin & Co Ltd 1910 Sess. C. 958
"It has also been held that incorporating goods so that they cannot be detached constitutes acceptance."
"In general the following may be regarded as acts inconsistent with the seller's ownership of the goods:
(i) using the goods more than is necessary in order to ascertain whether they conform to the contract..."
You might want your solicitor to also look at Section 53(2) which offers a Consumer (i.e. you) a right to request cure.
This applies where you have accepted (under Section 34 and Section 35), there has been a breach of a condition of the contract, you've acted promptly, are a consumer (as opposed to a commercial purchaser) and allows you to request that the seller remedies, replaces and if he refuses you are entitled to reject the goods.
Might be of help. I'm not too certain regarding your case whether it applies because of the fact that you laid down the tiles (this might interfere with the "promptly" requirement). In any case, your rights would also be limited to a. getting a set of polished tiles, or b. if the seller preferred a refund.