do you have an owners hand book, if so it should be inside the front or back cover or on a card in the pack
if not then contact your local main dealer they should be able to get it, ours did the same, and we had to get that from our local main dealer, cost us £10 for it, im positive that went in the parts or service managers pocket, but it was only £10, better than it going in to them at £75 per hour labour charge for them to do it