Our hobby involves wandering around Cambridge and environs, armed to the teeth, with realistic looking weaponry.
(God only knows how the Assassins cope with this, but that's a different story.)
You may, at some point, be approached by members of Cambridge constabulary, asking wtf you're doing. I have had this while standing at a bus-stop in full kit. Leo had them knock on his door after being reported by his neighbours. Anyone walking through town carrying a big sword may get this.
I feel it worth mentioning at this point that people are getting lax about the obvious precautions like always carrying weapons in bags (or even wrapped in bin liners). It's worth being careful when you can. --Pufferfish
In the event of being questioned by the police:
1)Stay calm
2)Be polite
3)Offer them the weaponry to examine. Point out that it is mainly made out of foam, or is otherwise harmless.
4)Do not try to explain LARPing to them, unless they ask.
5)Say the weapons are theatrical props, or that they are for a game you are playing as part of a Cambridge Uni student society. This is perfectly true.
6)Mention Treasure Trap by name if asked.
7)Volunteer that we are normally playing a room somewhere, or well away from anyone else, and are very careful to avoid injuring each other, and especially members of the public.
8)Remember rule 1.
And then, come and tell us about it.