Here are my references on lighthouses.
http://www.unc.edu/~rowlett/lighthouse/engs.htm
This gives a list of all the lights on the south coast.
If you scroll back on this site you will find a link to a similar list of the North Sea Coast.
I dont know how far you need to go in each direction.
Trinity House have a gallery of pictures here
http://www.trinityhouse.co.uk/interacti ... index.html
I would suggest that you definitely do Beachy Head Light --- everyone knows it. (slight exageration) but its a good landmark in the centre of the battle area.
The Needles Light on Isle of Wight is also a good scenic site.
Dungeness is also very prominent.
-----------------------
This is another lighthouse guide sorted by county which may be useful
http://www.michaelmillichamp.ukgateway.net/page2.html
Just a text list it description no photos
I notice looking at the lighthouses that many of the photos have helicopter pads on the top.
These are of course post war features.
------------------------
Lightships
http://www.feuerschiffseite.de/u-englgb.htm
Photos of typical british light vessels on this page.
I think there were 3 on the Goodwin Sands - east of Kent
Also a number in the Thames at the Medway.
They are very noticeable because of the colour so may be desirable to include as visual navigation aid.
This is a location map for the Goodwin Sands Lightships
http://www.whitecliffscountry.org.uk/he ... odwins.gif
Good Lightship images here
http://www.simplonpc.co.uk/TrinityHouse_Lightships.html
I also have a number of references for Solent Forts which mounted AA guns in WWII if you want them. There were also sea forts in the Thames but I think they were built after BoB.