Invasion attempt? - Shingle street

I am just reading Most Secret. The Hidden History of Orford Ness, it has quite a lot of info on shingle street, if anyone is interested I can post the relevant passages

 

I have found this thread fascinating; my father was part of a navy loan to the army of 4 inch mobile guns, transport, and manpower in 1940, sometime after Dunkirk, in response to the expectation of invasion or exploratory parties, and they were posted to the east coast. He did not know where the other units were posted. Officially they were anti-aircraft units but secretly they were to monitor the local beaches and keep watch for parachute troops. They travelled by day and 'observed' overnight, and were not supposed to spend more than one night in any area. On several occasions they were bombed, but my father's opinion was that the aircraft were offloading before returning to base (even though he was once blown over a churchyard wall and draped over a gravestone). Sometimes they had instructions by despatch rider, most of the time they just 'moved on' and found a suitable place (preferably near a village with a fish and chip shop because they were not well supplied with food or cooking facilities).

This lifestyle became exhausting so my father headed for HMS Ganges at Shotley, where he found some mates who suggested he approached the CO. As half his crew were navy (the rest army, ??Royal Artillery) they were given permission to sign in and bed down, so they had an opportunity for a bath and a 'dhobi day' to wash and change their clothes and some decent food, plus a couple of nights sleep.

Although my father's naval record shows this brief time at Ganges, there seems to be no information in either service about these groups (I saw two others leave RNB Portsmouth when my father's transport left), where they went and what they did, but they were certainly briefed to watch for any attempt at invasion, by air or sea. They reported that no attempts were made/discovered.

Ednamay

 

There are references in newspaper articles to research by German historians: Konrad Berg (suggesting there was a small failed German raid in 1940) and Arno Abendroth (suggesting the Germans were aware of a accidental lighting of a British flame defence causing casualties). Has anyone seen the actual research or have contact details for them?