I would definitely contact the shop you bought it from and see if they will supply a replacement for free. It is up to the seller, not the manufacturer to supply goods that are -

Of satisfactory quality

Goods must meet the standard that a reasonable person would regard as satisfactory, taking account of any description of the goods, the price and all other relevant circumstances. The quality of goods includes their appearance and finish, their safety and their durability. Goods must be free from defects, even minor ones, except where these defects have been brought to your attention by the seller (perhaps the goods are being sold as 'shop-soiled'). You can also take into account whether information in advertisements about specific features of the goods is accurate. Goods must also be safe when used properly.

And

Fit for their purposes

If they want to get funny about it, state that you know your consumer rights and start quoting parts of "The Sale of Goods Act 1979", and "The Supply of Goods and Services Act 1982"

Its up to them to contact the manufacturer and arrange a replacement.