The council currently has a £70m contract with Serco for IT, finance, HR and other services.Read more
BBC Radio Devon
There could be disruption at Devonport - and other docks and ports in the UK - if port workers vote to strike.
The Unite union is balloting members on industrial action after it rejected what's been described as a "derisory" pay offer from Serco Marine Services.
If tug boat crews vote to strike, it could affect the movement of Royal Navy ships.
Portsmouth could also be affected; while, in Scotland, the action could affect ports in Greenock, Faslane and Kyle.