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A startling, throwaway line from the Prince of Wales while on an army engagement raises one huge question about his father’s future.

It’s not often you find 780 square kilometres of free space in crammed modern Britain, so what better thing to do with Salisbury Plain than dot it with guns and let some gung-ho army recruits have a right old blast off?

And where better to take a prince (William of Wales) to fire some live rounds and to get in some much-needed practice wearing the combat uniform of the Welsh Guards, the elite regiment of which he is the Colonel?

Boom, boom, boom, went the 42-year-old on Tuesday as he shot a sniper rifle and watched the Guards fiddle about with some drones.