Traffic Free Circular Bike Rides North West England

Hi, I am looking for some ideas of bikes rides to do as a family but my son is only 5, although he is very confident on his bike. We would ideally like to find some circular routes which are traffic free anywhere around the North West England. Any ideas would be appreciated?
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http://www.visitlancashire.com/site/things-to-do/cycling/family-friendly-and-off-road-routes
Cheers
Alasdair
GT Arrowhead
http://www.facebook.com/groups/eastbradfordcyclingclub/
http://www.facebook.com/groups/eastbradfordcyclingclub/
Where I live (Monton near Eccles) has access to the Worsley loop-lines. You can then get traffic free (and pretty flat) all the way to Bolton. For a loop you can turn off and come back along the Bridgewater canal or through Worsley golf-course (going on a very quiet road for about 300 yards).
My six year old has been doing that route for years and my three year old is pretty good on it on his balance Islabike.
It's not a circular tho.
Do you go top Delamere Forest at all?
The only problem with this route are the masses of tourists who shout censored at you if you're going on a road bike of some sort...:D Amount of times I've heard "vrooomm" or have people shout stuff to try and knock the concentration, it kind of gets old.