I know this stereotypical image of British people: they have minimum social contact; give utmost importance to their personal space; prefer not to be attentive to others, especially in the middle of London.
I think this expectation works for the most part, but there are exceptions too. While I was telling my brother, who visited me in London, how British people never even look at one another in the underground, an old lady who pretty much looked like Queen Elizabeth approached and asked: "may I ask if you are twins? You really look like each other!" I think she noticed we were not twins, otherwise she would not have asked the q.
by the way, I have different memories about carrying the markers of Iron Maiden identity in UK. Some react to them for sure.