The overhaul at the Moray airbase is planned over the next two years to prepare for the arrival of new Poseidon P-8 spy planes and another squadron of Typhoons.

The project includes resurfacing and extending existing runways and taxiways as well as building new aircraft standing areas.

It is hoped the project, which is estimated to be worth between £50million and £100million, will lead to work for Moray firms.

Potential bidders have been told that the base will have to remain fully operational while the work is being done.

Moray MP Douglas Ross explained the complex RAF Lossiemouth development programme project (LDP), which will eventually total £400m, will create a legacy for the region.

He said: “This contract is another sign of the massive investment we will see by the MOD and the UK government over the next few months and years as they prepare for the arrival of the P-8s.

“I’m hopeful that local businesses can benefit from some of the works that will take place during that time.

“There is no doubt that the increase in contractors and personnel during the works and when the base is fully upgraded will be a major boost to Lossiemouth and the wider Moray area.”

The contract is expected to be awarded in spring next year with the work due to take about 18 months to complete.

Consultant WYG is project manager.