Work has got under way to fell the oak trees being used to ensure traditional methods are maintained for renovations to Nelson's flagship HMS Victory.

Three Scottish estates have donated 10 oak trees and 11 elm trees towards the 15-year conservation project on the world's oldest commissioned warship which is berthed at Portsmouth Historic Dockyard, Hampshire.

HMS Victory, which carried Nelson for his greatest and final battle at Trafalgar, was built 250 years ago from more than 5,500 oak trees and the ship inspired the Royal Navy's anthem march Hearts Of Oak.

Now the Aberdeenshire estates of Dunecht, Haddo and MacRobert Trust have donated timber to continue the tradition as Victory, which was launched in 1767, enters its 250th year.

Workers at the Dunecht Estate have begun to fell the 10 oaks and four elms which owner Charles Pearson has donated to the project.

Lord Aberdeen of the Haddo Estate has also donated five elms and Rear Admiral Christopher Hockley of the MacRobert Trust Estate has donated two elms.

Andrew Baines, head of historic ships at the National Museum of the Royal Navy (NMRN), explained that recent research on HMS Victory has shown that oak is the best timber to use for future conservation.

He said: "Currently the ship comprises a variety of hardwoods from years of maintenance. The return to oak is much welcomed. It demonstrates the serious archaeological research we are undertaking about the ship's composition, from timber to paint analysis and our commitment to ensure she remains sustainable for centuries to come.

"Interestingly we understand that some 30% of the fleet at the Battle of Trafalgar hailed from Scotland so it feels entirely appropriate that timber from these estates should be playing such a big part in her future security."

The elm is being used for the ship's structure below the waterline where it will be used for the keel which is one of the oldest surviving parts of the ship and remains exposed in the dry dock.

Mr Baines said: "The quantity of elm donated by all three estates will serve as an important resource for this area in the future.

"Those elms which may not be suited to the particular size and shape of the keel can be made into new gun-carriages."

Felling of the trees has been delayed by the recent poor weather and flooding but once felled the timber will be transported to the Whitney sawmill in Hereford where it will be inspected and sawed to specific dimensions appropriate for use onboard the ship.

The oak is likely to become planking and the elm is to remain in large blocks needed for the keel.

A NMRN spokeswoman said: "The timber will then be transferred to Portsmouth where it will be seasoned, so it can be dry and strong when used. This process could take as long as four years. The longer the oak is seasoned, the stronger it becomes.

"The oak planking will therefore go into a dry storage facility, a very rare grade one listed rope walk once used to make the rope for ships like HMS Victory."