usually just invent a business and say that i'm self employed. or that I work for some stupidly rich guy who is as tight as russell brand's jeans - that usually stumps them.
alias, and careful about anything that has my name on it etc....
usually take my stuff in to the bathroom when i have a shower, just incase.
although, I do remember seeing a WG's work ID whilst I was using the facilities once, carelessly left on the bathroom windowsill.
claimed to be english through and through, she was probably born in England but her name was distinctly EE. didn't bother me, was an ok punt, many moons ago.