A note from Robert Hurrell of the Environment Agency...
The Environment Agency has Post Mortems
(PM's) carried out on all dead Otters that they can safely get access to. Many
are unfortunately killed crossing roads but there are many other potential
causes of death to these largely elusive mammals. The PM's provide data on many
different aspects of Otter biology so a great deal of valuable information is
being gained about this animal and the health of the water environment. If you
find a dead Otter please contact 08708 500250 and ask to speak to your local
Environment Agency Fisheries and Biodiversity team.
It's worth adding that PM results are apparently made available to the finder too, if he/she wants them.