Siegfried decides the time has come to hire a full-time assistant and he thinks he has the perfect candidate in Calum Buchanan. Tristan is now a full-time employee of the Ministry of Agriculture where he sets his sights on the attractive Deirdre McEwan. Mrs. Pumphrey needs uncle Herriot's help when Tricki Woo goes 'flop bot', yet again. James is invited to join the local milk subcommittee, but is concerned as to whether he can afford it. Siegfried has difficulties with a colleague, Mottram, who is convinced that Siegfried is poaching his clients.