There is a northerly wind but a pleasant chilly day for a walk on the beach.
There are 4 forts in the sea and this one to the left is known as Spitbank Fort. https://en.m.wikipedia.org/wiki/Spitbank_Fort
Looking across the stretch of sea (The Solent) is the Isle of Wight at the southerly point of the U.K.
the people look very close together where in fact they are well distanced.
It looks like a lot of people on the beach but it is an excellent example of how photography can be used to show something different than what is really there. Thanks for including the information about the fort and it fascinating history.