The last Environment Agency otter survey in 2010 recorded 35 instances of otter sightings in the Stour catchment from Pegwell Bay to Godmersham on the river and around the north coast, none in the Dour.
I downloaded the report form
here but the format seems to have changed when I just checked it was still there.
Also if anyone is interested, there is an Environment Agency consultation on Choices and Challenges facing the water environment in our region, open to individuals and organisations until Dec 22nd-
view here.