There may be a few otters depicted in churches but they are usually relatively modern; like this window in Newcastle Cathedral. It references a legend that St Cuthbert prayed standing up to his neck in the North Sea at night and in the morning was warmed up on the shore by otters.
“The Titles Deprivation Act (1917) is an Act of Parliament of the United Kingdom which authorised enemies of the United Kingdom during the First World War to be deprived of their British peerages and royal titles.”(Wikipedia)