A historic Pembrokeshire port beacon has undergone a multi-million-pound refit.

The Mid Channel Rock lighthouse, known to mariners as 'the Pole', has withstood Atlantic storms for nearly 60 years, guiding more than a billion metric tons of shipping into the Port of Milford Haven.

The beacon, which is bedded on an undersea reef, warns ships of shallow rocks at the entrance to the port.

In recent years, it has also provided weather and sea condition information to commercial and leisure sailors.

The Port of Milford Haven led the project, which involved lowering a 25-tonne steel sleeve over the tower and reinforcing it with infill.

The Port of Milford Haven lighthouse beacon has been in place for around 60 yearsThe Port of Milford Haven lighthouse beacon has been in place for around 60 years (Image: Port of Milford Haven)

One of the tripod legs that support the column was also reinforced, and new electrical systems and weather monitoring equipment were installed.

Shan McGarty, the port’s project manager, said: "This project has been long in the planning, taking several years to move from initial concept to completion due to the complexity of the task.

"Once works began they were delivered relatively swiftly despite the difficult working conditions we faced, including strong winds and heavy seas."

The Port of Milford Haven’s harbourmaster, Mike Ryan, said: "It is our job to ensure the safe navigation of these waters for everyone that uses them and that’s why an investment such as this is top of our priorities.

"Not only is the Mid Channel Rock lighthouse a highly visible mark for all, it’s also an essential part of our weather and sea monitoring systems helping us plan shipping movements.

"And for sailors coming from often heavy seas, this historic marker will continue to stand proud as a welcome to the sheltered harbour at the Port of Milford Haven for many years to come."