Just returned from 2 nights stay at Tredegar to meet friends from Swansea. It's an attractive and sheltered site, neat clean & tidy with mature trees, shrubs and hedges.  A thank you for a lovely welcome from helpful wardens, and a wonderfully warm shower block!   Yes we could hear a hum from M4, but maybe as we were pitched on the lower level it was not at all intrusive. Access to the park is just by the site entrance.  Here we saw a children's playground & the park has vast open spaces, for playing & picnics, a beautiful lake &  the whole area has a well prepared & marked 'walk' around it. (I used my little folding bike to exercise my energetic dog!) Our stay was far too short.... So we will be back!