I've noticed a few what I consider to be EE profiles saying that they are British recently.
Lasses can change their nationality to British after they've been verified.
I'm not fully sure about this.
If it was possibler to change it, then I would have thought Hannah would have changed hers long time ago, given the constant queries she gets regarding the Singaporean Nationality she still shows:
External Link/Members Only or
External Link/Members OnlyOne or two EM based EE girls show trhemselves to be British Nationality, but these have been in the UK for a long, long time, and I suspect they have now obtained their UK nationality / red passport.
I could be wrong.