Blighty budgets vary a lot!!
based on my research (which incidentally is restricted to QL)I have worked out the following essential costs for my family (self & wife)

2 BR apartment 8500-9500 pm
Electricity + Water 1000 pm
Telephone+Internet+Cable 1000 pm
Auto lease + Ins. + Fuel 2000 pm (if you drive a Corolla etc)
Groceries 2500 pm

Hope this helps and hope I am right. Otherwise I am in trouble as I have accepted the offer!!! )-: