Ulrich - sounds a good trip - just leave yourself time for:
North Foreland, Princes, Royal St George's, Royal Cinque Ports, Walmer and Kingsdown, Littlestone, Rye, Piltdown, Crowborough, Royal Ashdown Forest, West Sussex, Worthing, Hayling, Stoneham, Ferndown, Parkstone, Broadstone, Isle of Purbeck. You are then left with a bit of a hike, but as the next journey is substantial you may as well cross over to the West Coast of Devon, rather than the East and then you have Saunton, Royal North Devon, Bude & North Cornwall, St Enodoc, Trevose, West Cornwall, and finally down to Mullion. Unfortunately, this way you miss out on Bovey Manor and Yelverton but perhaps you can negotiate a few days' sick leave!