Prospect, which represents staff in the MOD fire and defence rescue services, warned that pressing ahead with privatisation while lessons are still being learnt from the collapse of Carillion is wrong.

Capita was in competition with Serco for a Defence Fire and Rescue Service (DFRS) contract believed to be worth around £550 million. The service provides fire services on military bases, airfields and munitions sites.

Last month Prospect wrote to MPs supporting calls from Julian Lewis, chair of the House of Commons Defence Select Committee, for the privatisation to be halted while the contract was examined.

Prospect told MPs that they were concerned the projected savings could not be delivered without increasing the risk to defence.

The union also said that the existing in-house provision has been systematically run down with massive cuts and underfunding stifling the in-house service's ability to deliver efficiencies and introduce new technology.

Garry Graham, Prospect deputy general secretary said: “We are deeply disappointed that the government has pressed ahead with the privatisation of this vital service without providing any reassurance about how it will impact on quality, affect staff or avoid the same troubles as faced by Carillion.

“There is a very real risk that the MOD will end up paying over the odds for a much worse service than they would have had if they had just invested properly in the in-house service and the dedicated staff who work there.

“The constant drive to outsource services is not working for the MOD, the taxpayer or the workforce. It is time for ministers step back and make the right decision to protect this service for the future.

“We will now be working with our members to ensure jobs, quality and services are protected.”

The concerns raised by Prospect with MPs in early June included:

• The projected savings cannot be delivered without increasing the risk to defence.
• The existing in-house provision has been systematically run down with massive cuts and underfunding stifling its ability to deliver efficiencies and introduce new technology.
• Although the whole life cost of the project is estimated to be around £400 million, the true cost of providing fire risk management to defence is more likely to be around £1.2 billion (when the governance organisation, defence fire safety regulator, Cyprus locally employed civilians, USVF staff, RAF and Royal Navy firefighters and extant multi-activity contracts are included).
• The contract does not include additional work such as maintaining fire extinguishers at MOD establishments which is currently done by the in-house service at a cost of approximately £7,000 per 100 extinguishers a year. This would need to be done through another contract and borne by local budgets which are already heavily squeezed. The cost of this additional work has not been considered.
• Bidders have been offered around £60 million towards the cost of new vehicles with moves to make these purchases exempt from VAT.
• Projected savings need to be subject to independent scrutiny. For example, statements have been made about projected savings on pensions costs which may be inaccurate.