Benefits query

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Ladies, I want to find out a few things. If I earn over £30K and I am a single parent would I be entitled to any child benefits? What's the 'trick' to falling within the threshold of receiving some help? I know people think £30K is a lot but it's nothing in London! Can't even afford to rent a 1 bedroom flat let alone support a child. What about housing benefit, does it also depend on income? Any helpful information will be greatly appreciated.