Union members at the MoD's Defence Logistics Organisation (DLO) will work to rule and refuse to do overtime over plans to move jobs to Bath and Bristol.

The proposals affect staff at Andover, Hants; Caversfield, Oxon; Wyton, Cambs; Telford, Shropshire; Sherborne, Dorset and Yeovilton in Somerset.

Unions said the action would seriously disrupt supplies to the armed forces.

This unprecedented vote by MoD staff illustrates the strength of anger Mark Serwotka, PCS union

However, a spokesman for the DLO said it was currently impossible to determine the impact the action would have on supplies to the armed forces.

The dispute affects about 4,000 staff at the DLO, which is being co-located with the Defence Procurement Agency under the MoD plans.

Mark Serwotka, Public and Commercial Services Union (PCS) general secretary, said: "This unprecedented vote by MoD staff illustrates the strength of anger over the arbitrary and flawed nature of these plans which are being forced through with little consultation.

'Unions consulted'

"Dedicated staff who support our armed forces across the globe are dismayed over plans which will not only damage the local economies of the sites affected, but force families to uproot and move to one of the most expensive areas of the country without any guarantee on job security."

The DLO spokesman said: "The unions have been kept informed on progress on this important initiative and given the opportunity to contribute to issues affecting staff.

"If it is found this action is affecting our ability to perform to the required standard then obviously that may require some sort of action to be taken.

"At the moment it is impossible to say what the effect will be."

The MoD has said the planned merger would save about �200m over 25 years.