The version in <<ddpub:The Kiwi Book#695>> specifies the music as Calver Lodge. The earlier publication in <<ddpub:The Red Book#757>>  proposes <<ddrec:Kenmure's On and Awa'#930>>.

The introduction to <<ddpub:The Red Book#757>> says *the title comes from the T.V. series 'The Black Adder' and the immortal lines 'I have a plan so cunning you could pin a tail on it and call it a weasel'.*