It will be interesting to see how things change next year as of course the last census was before the 2014 referendum. The question of identity was maybe less politicised in 2011 as it will be in 2021. I'd still expect some degree of British identity as being in the minority but I think there might be a bit more this time round as folk make a choice based more on politics. I know my wife who is a No supporter (the question is best avoided in our house to keep away from arguments) used to call herself Scottish and English as she has one parent from each country and was born and raised in Norfolk. Now she identifies as British Only and refuses to say she is either English or Scottish!!!