B&Q are the largest tile importer in the UK. Their ranges change often and they sell off discontinued tiles so that customers are more likely then going to renovate or retile at least.
The thread will stay up and it's happened before where somebody kept some under the bath / in the shed etc.
But you got any pictures of the damaged ones or the area you need the tiles for? Perhaps we can help suggest something, contrasting colour somehow, would that work?