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house prices
This is the real issue. We live in a 1.5 bed house, with a 4 year old and a 1.5 year old. We can't afford a bigger house in the area we live in (Forest Gate) so we'd have to move further out and stretch ourselves financially to do so. At that point you start to question whether you're really living in London anymore and whether it's worth the financial strain to live in a suburb.
that's exactly what we ended up doing but in manchester and with kid a bit younger. i think London is a great place to raise a kid and they'll have many more opportunities. but it's not until you leave that you realise it's not the centre of the universe and that house prices are a bizarre self-perpetuating fiction