I reckon to save QR15K/month is possible. Fully furnished Apartment range from 7-12K/mth. Rental would be your highest expenditure. Food is about 3-4K a month for a family of 3. Eating out same as in UK I guess. Cars are cheap, same price as in US. Petrol is cheap at .55-.75/litre. All currency in QR.
Best of luck.
PORSCHE168.