Well in my defence, we were looking for birds when this thing swam past.
http://andyburnsphotography.zenfolio.com/wildlife/h170f277d#h170f277d
I am assuming it was an otter as it was well over a metre long …but confused over the ‘pink’ nose. Looking at pics on the internet, some otters do have pink noses – but they look very young. This one seemed to be big. Great to see an otter here again (I did see one in the same place last year – under the bridge between east and west lakes).
Also a cracking first winter YLG on the posts in the west lake hunting for frogs.
http://andyburnsphotography.zenfolio.com/p12189958/h367a25ea#h367a25ea
Glamorgan Bird Club 
I think you have a mink there Andy-fluffy tail and pinky pointed face.Otter also usually has head above water then a section submerged then back end emerges so it looks like it is swimming in 2 sections.
My first thought when I saw it was Mink – The head looks too small for an Otter.
I have seen a Mink before at Cosmeston, but a long time ago. It’s not a vey welcome visitor!
Looks like a mini to me too, unfortunately. Well caught though!
Errr… Mink. Not mini. Just to clarify!
Thanks guys. I did think “mink” but it just seemed too long. It was a well over a metre long. The fluffy tail worried me as well. Thanks for the help.
Still a nice photo Andy, even if it is of a menace!