I caught a glimpse of this lovely sloop while we were walking along the foreshore at Mylor in Cornwall. Even from a distance she looked fantastic so I walked right around the marina for a closer look.She looks new and I'm guessing she is a version of the Herreshoff designed 12 1/2 - also known as the Buzzard's Bay.
While the original was a keel boat, Joel White designed a centreboard version known as the Haven 12 1/2. A quick Google revealed that one was built by two students at the Boat Building Acadamy at Lyme Regis - see Gavin Atkin's In the Boatshed.
If it's the same boat they certainly made a fine job of her. Shame about the fenders, but it was the best shot I could get.