Prison Officers Association & Others v (1) Gough (2) Cox - Prison officers were employees of both HMPS and POA  EAT
A person can have two jobs with separate employers at the same time providing they are compatible with each other.
Messrs Gough and Cox were prison officers (working for HM Prison Service). They were also National Executive Officers (NEO) within the Prison Officers Association (POA). For this they received annual remuneration from the POA and it was not disputed that they were "office holders". The remuneration was paid in the normal form of salary, with pay-slips and a P60, and was far more than just to cover expenses. NEO duties took up about 15% of their time, they were to protect members interests, and were answerable to POA senior officials and, potentially, subject to disciplinary sanctions in connection with how they performed their duties.