Now Phil, Leroy and Danny were being put through their paces in Hereford.

Phil had little to learn – he could probably have taught most of the instructors a thing or two – but it was important that the three got to know and trust each other, and the best way to achieve this was to train together, working as a team. Fergus also wanted Phil there to keep a watchful eye on Danny and, to a lesser extent, on Leroy, who was being taught weapon-handling drills he'd never learned with MI5.

The ten-day build-up was now virtually over, and Danny was knackered, physically, mentally and even emotionally. There was so much to take in. But he'd not only hugely increased his personal fitness levels; he'd also been fast-tracked through both standard and advanced driving courses, and improved his street craft and trade craft, which Fergus had spent more than a year trying to drum into him.

There had been MOE work, where Danny had learned how to covertly break into locations so that he could carry out close target recces.

And there had been extensive weapons training: if Danny was old enough to carry a weapon, he was old enough to use it. And there was no point in him learning how to handle a weapon unless he was willing and able to pull the trigger – to save his own life, or someone else's. He had to accept that if ever he pointed a weapon at someone, he had to shoot to kill. So 'Show your hands or I will shoot' could never be merely a threat. If he said it, he had to mean it.

He'd become familiar with a comprehensive range of weaponry, ranging from the latest 9mm pistols and 5.56mm assault rifles to the sort of stuff used by street gangs – revolvers and shotguns.

Now Danny was embarking on a final day of tests. He was holding a 9mm Sig semi-automatic pistol. The weapon already had a familiar feel in his hands, and so far he had acquitted himself well on the ranges and in various exercises.