Taken on South Parade Pier Southsea, Hampshire.

The building you can barely see on the horizon (on the right hand side) enveloped in the mist is Horse Sand Fort, one of a number of forts built in the waters of the Solent over 150 years ago in response to a perceived invasion by the French, which never actually happened.

Some history here if you're interested: solentforts.com/about/solent-fort-history

........and a history of the Pier here: en.wikipedia.org/wiki/South_Parade_Pier

I added a bit of information about the fort (even though it is not the subject of the photo), as I know you are an inquisitive bunch on here, and that someone was probably going to ask me what it was :-))