The deal, which the ministry hopes to close late next year, will involve the provision of property, facilities maintenance and capital works. The first phase will be capital works projects; these should be operational in early 2003.
The consortiums are:
- Amec Turner: Amec Group, Turner Facilities management
- Debut: Bovis Lend Lease and Unicorn consultancy service
- Serco-Morrison: Serco and Morrison Government Services
- Diamond: Carillion Services and Mitie Property Services.
The winning bidder will work in collaboration with the Ministry of Defence's integrated project team to improve the condition of the estate.
This will be the first of five Scottish deals.
Each of the others will also be worth more than £400m.
Secretary of state for defence Geoff Hoon said he was pleased with the progress that has been made with the roll-out of prime contracting, particularly in Scotland.