Do you think Android is more prevalent outside London, or have you just had a different experience to me?
I'm in Cardiff and I see quite a few more Android phones than I do iPhones.
Mind you, there is That Guy who sits watching Pointless on streaming TV on his iPad on the way home each night...
And I think the gap has grown even more in the last year (in Apple's disadvantage).
Iphones are pretty "visible" indeed, depends where and when you travel. At work however over 90% of the people use non-apple stuff.
People who live in London and commute by tube automatically fall into an above-average income bracket. In my experience they're far more likely to have the disposable income to get an iPhone over a cheaper smartphone.