We love this site, we only live 20 mins down the M4!! You wouldn't think the site is where it is, a truly lovely location.  The benefit of accessing Tredegar House grounds is perfect after closing hours.  We like to book this site in the autumn as the trees and wildlife is beautiful then.  Cardiff town centre is a 15 mins drive away and there is a bus route if you didn't want to take the car/motorhome.  An Asda superstore is located near by for all of your groceries and petrol. However a chip shop and a Spar shop is literally a walk through the park.