Is sending a chain email illegal in the UK ?
It depends on the nature of the chain letters exactly.If the letters are of a criminal or immoral nature then it would be illegal and you would actally be guilty of incitement. But the chain letters themselves are not illegal it is what is contained in them that may cause a problem.In your case these chain letters to promote dating is not a crime this is perfectly normal. If you were sending chain letters lets say encouraging the use of marijuana then you would be promoting and supporting an illegal and immoral cause and that would be the crime.Therefore the answer is no chain letters themselves are not illegal it is what you publicising that would have legal consequences.