Is this an otter?

Is this an otter?

Observation - Is this an otter?. Description: Came along a field with sheep in and disappeared from view. Reappeared out of a hole on the near side of the fence, looked at me and then scurried off down another hole in the sandy banking. It was near a stream which ran into the sea about 100m away. I

Came along a field with sheep in and disappeared from view. Reappeared out of a hole on the near side of the fence, looked at me and then scurried off down another hole in the sandy banking. It was near a stream which ran into the sea about 100m away.
I did see an otter in the sea nearby - swimming from rock to rock - but this animal looks a lot darker with lighter patches than the otter I saw in the sea.