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"It has been frustrating but family and friends have been invaluable, the hospital was absolutely superb and the university has been exceptional."

Although delayed by the contractors going into administration, they say James's ongoing support has been "invaluable"

But not every dog owner cares to learn this invaluable lesson.

Second, that sort of intelligence would have been invaluable to the enemy because it would expose so-called sources and methods of how the intelligence had been gathered.

"Performing live for the first time, even if just for a handful of listeners, provides invaluable experience," he said.