Stick the thing in checked baggage and you will be fine getting it in.
If you somehow end up being questioned by a copper once in London, do not, under any circumstances, indicate that anything you are carrying is for self defence. Although proportionate acts of self defence are as legal as in the US, any act that indicates preparation of violence in advance, even defensive violence, is considered 'offensive', and can get you arrested.
Sure this has been said, but to reiterate, do not carry anything with a crenelated bezel and do not wander the streets with a 4D Maglite or similar.
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