specialist

Boulter, ranked 24th in the world, is the nation's leading player, with Harriet Dart, Heather Watson and doubles specialist Olivia Nicholls completing the team in Spain.

"It was an electric night," said Andres White Correal, a jewellery specialist from Sotheby's, adding the unnamed female buyer was "ecstatic".

A former explosive ordnance specialist who was awarded a Bronze Star during Operation Enduring Freedom, he had developed into a quiet but effective leader.

There were also stints with the National Guard, Federal Emergency Management Agency, the CIA and the White House, where he served as a homeland security specialist under George W. Bush.

In an email exchange shown to BBC News last year, deep-sea specialist Rob McCallum told Rush that the sub should not be used for commercial deep dive operations and was placing passengers in a “dangerous dynamic”.