'Stealthily by Night' by Ian Trenowden is the story of the Combined Operations Pilotage Parties who trained at the Hayling Island Sailing Club to carry out covert reconnaissance of possible invasion beaches. Their difficult, extremely dangerous and secret work was absolutely key to ensuring our selection of beaches was better that it had been at Dieppe where the tanks got stuck in the shingle. There is currently a project afoot to create a memorial to these brave, but pretty much unknown men on Hayling sea front. The Amazon entry for the book [sorry, can't get the url to work] includes a review by Jim Booth, one of the Normandy beach COPPists. I can hardly better that! It seems to have been entered by John Ainsworth-Davis, a character best explored by Googling him. I have been unable to verify any of his claims to be a naval officer via the London Gazette. All that turned up was his 1968-9 bankruptcy.