Online UK business but moving to Canada - Tax, credits etc question

We (family of four - 2 adults and 2 children) wish to move to Canada from the UK. We qualify for the skilled progamme, get +70 points hands up. Currently waiting to do the language test.

Some time back we also set up a part time online business on autopilot here in the UK. It grew a little and now we have a small part time internet based business and one of us are registered as self employed (not much, lets say pocket money). The business is internet based and can be run from anywhere. We will continue to pay British national insurance and will receive the income in a British bank. In addition, we wish to rent our mortgage free house and pay the tax on rent in the UK.

My question is will we be in receipt of any benefits such as child benefits, tax credits etc in the UK. It's not that I want to take them, it's just that we wish to remain British Nationals and come back to live here later.
I would be grateful for your answers.