Novita is right on this one.  QR 15000 is the minimum for a 3-bedroom villa in Doha.  Don't forget utilities, cable, internet, phone, etc.  They all eat into the budget too.  Also compare the prices for groceries here versus the UK.  I was suprised at the cost of groceries here compared to where I am from. Also most companies here offer expats and families a free ticket back home at least once a year or every other year.

I don't think I would take this offer - especially if you have to pay back the QR 40K for furniture if you don't stay.