Contractors are being invited up to bid for the £100 million contract for an expansion of the military base at RAF Lossiemouth.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.