Well it's a shame no one replied!
Have a think about the Norfolk coast . Our place nr Yarmouth is 20 minutes drive from Corton and Winterton beaches. Corton official and really west to get to. Free parking. 500m walk. Winterton dunes a 25 minute walk north along the dunes to an unofficial naturist spot. And of course Holkham. ..about 50 minutes or so drive to the north Norfolk coast.