That's an astonishing statistic. The average income in the UK is £27,200 so that means most of the people who responded earn twice the national salary. If that's representative of the NSC audience, then that's demographic. Advertisers will be biting Bozza's hand off :)
I don't know about that. If were single I'd consider myself well-off on 40k let alone 50k. I'd probably trade by house for a flat and give myself about two grand spending money every month.
It's pretty meaningless without knowing the circumstances.
If you're living in London with a spouse who doesn't work and with four kids, you may well be struggling. If you're single or living with a working spouse with no kids oop North; you're quids in