I agree with you about the effects of immigration on the market but if I was neo-liberal like my Bulgarian friend, for example, who thinks that there should be a completely free market in labour, and that the market should decide when people stop moving to this country (when it is worse than Bulgaria, for example), then I would suggest that you accept market realities and not interfere with it by imposing socialist immigration controls.
Another state-interference in free markets is the prevention of building on the green belt by middle-class nimbys.
You see, this free market mularkey has it limits, wouldn't you agree?
NIMBYism isn't state interference, though. It's usually based on the use of existing laws to protect the rights of existing property owners. You might as well argue that copyright is an infringement of the free market.
I agree that the green belt is a restriction of the free market, but without it, the whole of the south east of England would essentially be a London-lite sprawl. However, I don't remember arguing in favour of an unregulated free market.