7.51 P.M.
The Lynx had stayed roughly level with the tops of the buildings as it had skirted South Audley Street but now, as Neville emerged into Grosvenor Square, the helicopter swooped towards him, free to dive and turn in the open area.
Doyle saw it dip towards Neville.
Saw Neville slow up slightly.
Saw him fumbling with the Steyr.
A loud bang sounded as one of the police marksmen fired at Neville.
The bullet struck the ground close to him.
Another loud retort.
Another miss.
Doyle swung the Beretta up and fired off more shots until the slide flew back signalling that the pistol was empty.
He pulled a spare magazine from his pocket and jammed it into the butt of the pistol, forced to slow down as he worked the slide, chambering a round.
As the Nissan slowed, Doyle saw what was happening.
'No!' he roared. 'Get away from him.'
His shout was directed at the helicopter which was dropping still lower, the noise of its rotors now deafening.
'I've got him,' said Clark, eye pressed tight to the telescopic sight.
Neville swung the Steyr upwards and tightened his finger on the trigger.
The fusillade raked the chopper, blasting in the windscreen, punching holes in the co-pilot's door. Bullets drilled the length of the helicopter.
One struck Clark, stove in part of his ribcage then erupted from his back.
He slumped forward in his seat as more bullets dotted the chopper, piercing the cabin door, drilling through the tail boom. One struck the tail skin and blasted it clean off.
McBride struggled with the controls, tried to lift the Lynx free but Neville jammed in a fresh magazine and opened up again, once more raking the helicopter from end to end.
Bullets screamed off the hull, punctured the cabin and tore through the vertical fin.
The tail rotor gearbox was hit. Pulverised by a concentrated burst of fire.
The chopper lurched violently in the air and McBride felt his stomach tighten as the instrument panel suddenly flashed with a dozen red warning lights.
The chopper began to spin hopelessly out of control, the end swinging round madly.
It was as if someone had nailed the main rotor to the sky and the chopper was turning around that central point.
It dipped crazily, the pilot yanking so hard on the joystick that it seemed he would wrench it free.
Then, with alarming speed, like a puppet with its strings cut, the chopper plummeted earthward.
It struck the ground in the centre of Grosvenor Square.
The explosion was massive. A conflagration so powerful it blew Neville over, spilling him from the bike.
The concussion blast even moved Doyle's car and the counter terrorist covered his face with one arm as a wave of intense heat rolled across the square.
An enormous cloud of black smoke and flame rose into the air as the chopper exploded with such ferocity that every window in the buildings around the square was blasted inwards.
Huge, twisted pieces of metal were hurled in every direction by the cataclysmic blast, spewing through the air like lumps of flaming shrapnel.
A piece of the main rotor, as if fired from a cannon, shot across the square and smashed through a parked car, impaling the vehicle which also exploded, adding its own chorus to the already ear-splitting hurricane of fire belching upwards into the darkening sky.
Blazing petrol ejaculated into the air and spilled across the ground, igniting everything it touched.
More cars began to burn. A whole series of secondary explosions were triggered, as if someone had let off a great chain of venomous and extremely powerful firecrackers.
The sky turned orange, then red, then black.
Noxious smoke rose and hung over the square like a reeking shroud.
Doyle saw Neville roll over on the ground, struggle to his feet, hurrying to pull the Harley Davidson upright.
The counter terrorist floored the accelerator and the Nissan hurtled towards Neville and the bike.
Neville spun around, had time to fire one single burst from the Steyr.
Doyle shouted in pain as a bullet tore through his left shoulder, cracked the collar bone and punched its way out of his back, ripping through the seat in the process, but he held on to the wheel, seeing Neville's face illuminated by the fire.
He saw the look of horror on the ex-para's face.
Then the car hit him.
Neville was catapulted ten feet into the air, such was the impact. He crashed earthward, landed on the roof of the car and rolled off, the Steyr falling from his grip.
Doyle slammed on the brakes and tumbled out of the car into the road, aware even more of the unbearable heat, which rolled across the square like a wave.
Blood was running freely from his shoulder and he could feel it beginning to stiffen, his left hand already going numb. He clutched the Beretta in his right hand and advanced towards Neville, who was lying on his back a few yards away.
Doyle stood over him and looked down at the ex-para.
His eyes were open, blood was running from his mouth and nose and, when he tried to speak, all that escaped was a liquid gurgle.
Doyle figured the impact of the car must have pulped his ribs, driven them into his lungs. His face was splashed with blood.
The counter terrorist knelt beside Neville and lifted his head with one hand, groaning with his own pain.
The visor of Neville's helmet had been broken. What remained of it was flipped open.
Doyle pushed the Beretta against the ex-para's cheek.
'Where's the bomb?' he grunted through clenched teeth.
Neville's eyes rolled and Doyle thought he was going to pass out but, instead, he realised that the dying man was trying to direct his attention to something.
'You're looking at it,' Neville managed to say before blood filled his mouth and he coughed, his face twisting into an agonised grimace. As he coughed, blood and sputum showered Doyle.
'Where?' Doyle demanded. 'Don't fucking die yet, you bastard.'
Neville coughed again, tried to turn his head then vomited a foul mixture of bile and blood, most of which spilled down his chest.
'The bike,' he whispered, and Doyle was sure he saw a smile flicker across those bloodied lips. 'It's packed with Semtex. It's all there.' He was gripped by a great fit of racking coughs and Doyle stood back as more blood and vomit spilled from his mouth. Great crimson clots splattered on to the road beside him.
Doyle could hear the wail of sirens more clearly now, even over the roar of flames from the wreck of the
