Thanks everybody - there were a lot of people around [as was to be expected] and as is always the case there were the dreaded children - I'm very lucky I don't have random shots of 7 year old's hats or gloves, as 2 or 3 children were running back and too following the otter and not having any regard for the fact I was obviously trying to photograph them, and they kept screaming, giggling and running in and out of the frame.
I'm quite happy with this, but feel that if I watch these at a quieter time I may be able to do better still, with dark clothes reflection's is easy enought to prevent and because I wear a black coat I'll simply point the camera at my 'chest' on my reflection and rapidly click as the otter glides past
And Jordan - thanks for the correction, I believe you're right with this one.