We'd have fought them on the beaches

Churchill said we'd fight them on the beaches, though would we have stopped them? Would we have won?  On the beaches, no. In the longer campaign, apparently, yes. In the 1970's 'Operation Sea Lion', the 1940 German invasion plan was war-gamed by 30 British and German military experts and was umpired by three military commanders (air, land, sea) from each country. Initially, the Germans broke through the coastal defences and pushed 10 miles inland establishing a beachhead, though the forces that made it ashore became overstretched and lacked supplies, and as the Luftwaffe couldn't dominate the skies, so Royal Navy was able to successfully stop any German re-enforcements or supplies reaching the beleaguered forces. The game started on September 19th 1940 and by the 28th of September 1940 the remaining German forces either escaped back to France or surrendered and were imprisoned, the umpires unanimously declared the German invasion a failure. Like many other beaches, Kimmeridge was hastily defended in 1940, of those defences 2 type 25 pillboxes and 2 lines of 'Dragons Teeth' anti tack obstacles remain. The ATO's and pillbox in the 2nd and 3rd photos have recently been cleared of invasive growth, whereas the other end of that ATO line have almost disappeared under natures blanket.  Even though many of these wartime defences have been removed from the archaeological record, you'd be surprised at how many remain hidden and forgotten, a testament to the extent of the defences thrown up in 1940.