This caption should read "a slightly nervous groom".
The location is Somerset House and our man in question is Nabeel, who just went with the flow, like so many of us guys on their wedding day.
I particularly like the loose composition of the shot. While the picture is all about the facial expression, it's not too tight as to deny the viewer of the proximity of the best man, and the fact they're clearly seconds away form the bride's arrival.
A simple moment caught forever. One of many on a lovely summer's day in town...