I agree with dgp when he said:
I think you're way above Third World in more than one sense. And it would be very difficult for the UK to slide down that much.
I have often thought of past world powers ( as viewed by WTB$, because there are others):
Egypt: where are they now?
Babylon( Iraq): where are they now?
Persia (Iran) where are they now?
Greece: where are they now?
Italy even: where are they now?
Anglo-America: where are they heading?
I think its just the natural cycle.
And that other countries can have a share of the cake is called solidarity. We mustn't be too selfish, though I accept that it could be anguishing.