Well, we have been living 'normally' in the house for 18 months plus now, so here are the gas and electricity numbers

Electricity:

We have the TV and computers on for much of the time plus I like lights!  Which probably explains the electricity consumption - I expect the lights explain most of the seasonal variation.

Gas:

The gas obviously varies a lot - during July and August it is probably just the hot water and hob.  I don't know how the peak of 125KwH compares to other people but the combined bill is acceptable for having doubled the house size...