Our cost of living is the same as the UK - some things cheaper, some more expensive. Our electric bill is around $350 per quarter - 5 of us, but not tonnes of electric equipment and we do have the cheapest type of air con. Electric bills will be more expensive if you don't have gas as well! Rates (council tax), petrol etc cheaper, but home wares and food a little more expensive.
We pay $50 a month for health insurance (all 5 of us) but that doesn't have hospital cover (as that is included in the reciprocal agreement). It covers dental, optical and physio - and ambo cover. Health insurance is hard to work out. Sometimes it's easier to know what you can afford to pay first!