The following images are of what Dave Gandy and I assumed to be the cub as it fed mid-river.
Two visits to Santon Downham in the Brecks in the past week have both produced brilliant encounters with Otters on the River Thet. The first was with a large animal that Will Soar and I thought was a male. The second, with Dave Gandy, involved an hour spent with a well-grown cub, plus a brief view (and interaction between the two) of an adult, presumably the cub's mother. These are the best views I have had of Otter other than further up the River Thet at Thetford a few winters ago. That included one individual sniffing my boot, so is unlikely to be beaten!
The same individual spent much of the hour we spent with it feeding in a clump of willows by the riverbank. A shame the light was so poor.
As we watched the youngster, a larger animal appeared upstream and swam towards it. It - the mother, we conjecture - hid on the opposite bank. After a while, the youngster joined it. They interacted, out of sight - but highly vocally, which I did manage to sound-record. Cracking encounters...
The photos above and the slideshow below related to the first individual.