The roar of the Puma’s blades was deafening. Each man had a two-way radio tucked inside his helmet, allowing him to receive instructions from the pilot. Nobody was speaking. In the moments before a mission kicked off, nobody ever spoke. Each man needed a few minutes of silence to settle himself, and to make his own peace with the certain knowledge that although there was a decent chance of coming back alive, the odds weren’t what any sane man would accept.

‘As Sir Winston Churchill said on the BBC, in July 1940,’ started Collinson, speaking over the radio so that his words were delivered crisply to each man on the chopper, ‘“This is a war of the unknown warriors; but let all strive without failing in faith or in duty, and the dark curse of tyranny will be lifted from our age.”’ He paused. ‘I just thought we should remember that in the next couple of hours, and maybe draw strength from it.’

Steve rolled his eyes. He took off his helmet, and pulled out the headphones embedded inside. ‘Funny, can’t hear a sodding thing,’ he said, shouting to make himself heard over the din of the engine. ‘Bloody kit must be on the blink already.’

The Puma had rolled high into the air as it approached the coast, but now it was dipping low, hugging the ground, as it flew over the docks, and took them straight into the heart of the city. By staying as close to the ground as possible, the chopper would be impossible to detect on radar, and a lot harder to hit with a missile launcher: the enemy had no time to get it in their sights before it had disappeared from view. But it made for a stomach-churning ride. Porter had done it a couple of times in Ulster, flying low over dangerous border country when it was controlled by the Provos, and he’d learnt not to bother eating anything in the few hours before a mission. It just ended up on your shoes. Glancing around, he could see Steve and Keith hanging on to the side of the machine, their expressions grim. And glancing across at Perry, he noted with just a touch of satisfaction that the man was holding on to his stomach. You’re going to be a bloody liability on this gig, mate, he thought to himself.

‘Twenty seconds, twenty seconds,’ shouted the pilot over their headphones.

The chopper shook violently as it dropped the last few feet out of the sky. The pilot knew exactly where the house was: the Coke tin in the gutter was sending out a signal powerful enough to guide him right home. But he was flying low now, skimming right through the streets, at roof level. Any higher, and it would give an opponent a chance to lock onto the Puma with a rocker launcher. Suddenly the chopper lurched violently upwards, and Porter could feel his stomach heaving. It shuddered then hovered in the air.