I posted this thread re Dover some time ago. All pictures would relate to 1940.
BUT, the ferry harbour to the east of Dover Harbour is a recent creation and would not have been present in 1940. Also, the yacht marina did not exist in 1940 as it was used as a standard harbour.
As mentioned earlier, the Pier did not exist in 1940. All that was present were the stone breakwaters.
The youtube video in the link gives an interesting and brief view of Dover Harbour during a Luftwaffe attack.
http://forum.1cpublishing.eu/showthread.php?t=11866