From Sue & Richard:
We followed it, walking quickly along the coast whenever the otter dived, and remaining motionless as soon as it surfaced. We continued to the next headland where, in the next bay, there was a second otter. It seemed to be acting oddly, swimming quickly in to shore then moving rapidly in and out of the water and over the rocks.
This behaviour continued for some time before they swam off together and we eventually lost sight of them as they left the water and disappeared into the rocks further along the coast.
Many thanks to Sue & Richard for super pictures and story.