Originally Posted by Sixth Freedom

For singletons

GBP 50k+ outside London
GBP 65k+ inside London

For couples

GBP 30k+ per person outside London
GBP 40k+ per person inside London

Assuming no kids, no debt and no risk of unemployment.

For each kid under 14, add GBP 20k per household. For each kid at 14 or over, add GBP 40k.