‘Be careful,’ said the man.

Charlie didn’t respond.

‘Very, very careful,’ insisted Hickley. He stood back, to let Charlie pass.

There had been an audience inside the sluices, as well as out, grouped around the centre runway to see what was happening. Two, both long timers, smiled just briefly in appreciation. Butterworth, controlling the main gangway, recognised his colleague’s defeat.

‘Move on!’ he said. ‘Everyone move on!’

There was jostling and further delay, while the slowly moving line became organised again. Instinctively Charlie stopped by the main sluice, where it was widest and where there were most people, rather than go into one of the side drains where he would have been in a cul de sac.

‘Move on,’ insisted Butterworth.

Doggedly Charlie remained where he was, letting other prisoners swirl and spill about him. He’d been backed into more blank alleys than this poxy lot put together and he didn’t intend the last day of the third month of his second year to start with some officially inspired thumping because he’d made some prison officer look a bloody fool. He was aware of Butterworth’s apologetic look to his friend beyond the doorway.

He realised that Prudell, who occupied the adjoining cell, had kept dutifully close to him. A Hickley man, Charlie knew; had to be because Hickley sanctioned the cell changes when Prudell got fed up with whatever prisoner he was screwing and felt like a change. And Prudell had sufficient muscle to keep the landing running smoothly.

‘Shaken but not stirred, is it?’ said Prudell, indicating the pot. He was a squat compact man serving eight years for grievous bodily harm: he’d nailed to his own desk the hand of a man who refused to pay protection money for a bingo hall in Haringay. The victim was sixty-eight years old.