Firstly, how would any reasonable person know that you had another question in another section? I certainly didn't until you pointed it out.
Secondly, in your original question, it is pointed out that the date is the manufactured date not the best before date.
Thirdly, as brachiopod states in answer to your other question, you obviously do not understand the difference between dates, as there is no legal terms such as sell-by or expiry date - the terms are use by and best before
Fourthly, and in answer to your question, there is no law against selling items after the best before date because as the term implies, the product is best consumed before that date, but may deteriorate in quality afterwards.
However an offence may have been committed under Section 14 of the Food Safety Act 1990 as the cider may not be of the 'quality demanded by the purchaser'.
Your first port of call will be to your local environmental health or trading standards. You will probably need to still have some contents of the can or if you have drunk the can and not thought there was anything wrong, then you will require stool and / or vomit samples.