After Grainger comes back to his department late from his coffee break, both Rumbold and Peacock institute a new rule requiring staff to sign out when taking a break and sign in when returning, to avoid future tardiness. When the floor staff refuse to do so, and Grainger is fined for his lateness, the group turn to Mr Mash to unionize them and get the management to drop the rule, although Grainger becomes concerned it could cause problems.