In reply to Ian Black:
It's not too late to involve your retailer.
See if they've got mats in stock, explain the situation too them, and ask them to take over dealing with it from Lyon. Lyon should be able to credit them the value of the mat, and even if the shop doesn't have one in stock - at least you have the possibility of exchange for another product (though i know there won't be anything quite the same.)
Oh, and make sure you take the time to talk to the person at the shop that deals with returns. All shops, no matter how good, have some useless monkeys.