Lamb Cottage Caravan Park nr. Sandiway ( 15mins from the M6,Junct 19. travel towards Chester on the A556 ) This is an adult only site,all pitches have water and waste facilities,and the toilet facilities are excellent.They have a web-site,and the owners stay on site.Approx.8mins from Northwich.
There's a site on the A57 going towards Manchester about 3 miles off the M6 JUNCTION 21. I reckon this is closest to motorway, though it's name escapes me. It's next to Warburton toll bridge over the Manchester ship canal.