>>> Wow, I think people need to look at the sale of goods act before commenting on things like its ok to sell anything
Rather pointless, surely, given that the Sale of Goods Act 1979 was repealed by Section 60 of the Consumer Rights Act 2015?
Further, the Sale of Goods Act only required that any goods sold should be in accordance with any description apparently relating to them (Section 13) and that they should be 'fit for purpose' (Section 14). Nothing in that Act, nor in the successor legislation, prevents the splitting of multi-pack items.
Clearly, where a retailer uses an EPOS system, to read bar codes on products, he needs to ensure that he doesn't put a single can of Coke through his tills at the same price as a pack of 6 but that still doesn't prevent him from splitting the pack (and many retailers, such as burger van operators, don't use EPOS tills anyway).