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Unsure. Can't afford to live in central Cambridge - at least not in the sort of family home with decent garden we'd like - so may be using car more, maybe two cars... Parents will be closer to soak up some childcare costs, hopefully, but anywhere within a few miles of the south City boundary with decent transport links looks savagely expensive...
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When do you need to move?
You might want to consider Northstowe. It's currently being built, just north of Cambridge. It is built around the new 'Busway' which is pretty quick to get into the centre of town for commuting and, as a new build place, will generally have much lower cost than more established villages.
Edit: to be clear; first houses are likely to be available from 2017 so you'd need to rent somewhere for 12 months first.
The rest of life will cost a little less though, no?