This is probably as good a time as any to ask this question of our UK members. Yes, England is an island with a huge coastline. But it's my understanding that a lot of this was unsuited for invasion (cliffs, unsuitable terrain, etc.). And ports were too well defended to directly assault. Exactly what areas on the Channel side of England had beaches suitable for Sealion? And what were their defenses (I would assume as the most likely targets they would get the highest priority for defenses)?
About the only believable area is between Dover and Portsmouth (not all of it, but a reasonable number of beaches)
Trouble is, you cant get too near Dover to the east, or Portsmouth to the west (unless you REALLY want to give the RN Xmas early!), so its a fairly narrow front.
To make it a bit more difficult, the beaches in this area require a very shallow draught (the tide goes out by a LONG way on pretty much all of them, the beaches are all very shallow), which makes life so much more difficult for an improvised landing craft.
The beaches were defended (nothing like the Atlantic coast, but barbed wire, some obstacles), and the defences steadily improved as time went on. There are Home Guard troops available everywhere, and regulars on anything vagualy resembling a port facility. All ports were set up for demolition.
East Anglia is easier for beaching, but you then get the problem of a long crossing (this time the RN based at Chatham and Harwich think you), plus the fact that, well, unless you like cabbages there isnt really anything in East Anglia for a long way.
Anything west of Portsmouth is again running into the RN based in Portsmouth and Plymouth...and there arent that many suitable landing beaches in the West country either.
Whosever designed the British Isles obviously didnt want visitors...
