Advice on cost of living in southern england for rent ect

We are a family of 5 and a dog wanting to  move to England.  We have 3 kids and want to check prices on rentals to see how it compares to Canada and see if we could afford to live there.
Which towns/cities are the cheapest?
Which towns are best for the kids activities like hockey, soccer, gymnastics?
I would prefer to be with in 1.5 hours to an airport pls.

thanks for any help...Krystal

Best start a Google search for the information.
www.numbeo.com  is a good website for cost of living and other information.