It would be illegal, in fact.

Mark became someone who added up. This made him less surprising. He dropped his science course, and took art history. He saved money to pay back the Army for their grants. He went on to run an art gallery. Somewhere in all those changes, he and Michael managed to become best friends, especially after Michael had met Philip.

Philip worshipped Mark. My ex-Army gallery owner who also plays rugby, Philip enthused, and took him to parties without Michael. Mark could more than hold his own at arty gatherings at which he doggedly wore blazers and cravats.

Mark never introduced his boyfriends. Mark's boyfriends evidently were not quite fit to be introduced. It was the first time that Michael noted a tendency in Mark towards secrecy. He kept aspects of his life in separate compartments.

Mark had developed a taste for leather and rough trade. He moved in with a rich banker, but they weren't lovers. They shared servants, and a games room, and gave parties in which people wore leather crotchless knickers. They called their joint townhouse the Cock Exchange. Michael never really felt comfortable with the grandees he met there, or the way in which the banker, especially, treated the people who worked for him.

Mark's face and manner remained disconcertingly fresh-faced. His eyebrows went prematurely shaggy, like an old general's, but there was something in his expression that reminded Michael of a child. He looked like a little boy who could play innocent.

Mark began to be away a lot on business or make excuses when invited to dinner, and to drive an old banger which he saw no point in replacing. He was ill and didn't want Michael to worry.

What do you say to someone who has died and who was one of the few people you could really talk to?

Perhaps you look at his face, suddenly returned to you, and consider saying all the things you never had a chance to say. You consider saying: you were a hero to me. You were so many things; it wasn't just the Army or the sport. There was your political work for the Labour Party, though everything about you signalled Tory. There was the way you knew the market value of every piece that came your way, including things you hated like the Pre-Raphaelites. There was the way you could explain to me how Picasso was a genius, so that I've seen Picasso differently ever since. There was the way you fixed your car, and the way you spent all Saturday afternoon playing rugby and two hours every Sunday morning tending your stocks and shares. There was the way you could give me advice on how to apply for research grants, advice that worked, or who at the Poly knew they had support in high places. You were astute and kind and sensible and strong.

All Michael said was, 'Hello old thing. Good to see you.'

They were in the car on the way to the clinic. Mark replied, cool and distant, 'Thank you.' Then he asked, askance, 'Why have you done this?'

Michael explained it to him, the miracle and what he thought it was for and why he needed Mark. It sounded so stark and self-interested that Michael apologized.

'Quite all right. I'm glad to be of use,' Mark replied. His attention seemed be distracted. His eye kept catching on shop signs or Evening Standard headlines talking about the Labour government.

'Can we stop?' he asked. 'There's just a few things I'd like.'

Of course, of course, Michael said, and pulled over. Mark bought an orange and a newspaper. He left both in the white paper bag.

Introductions over with.

Once inside the clinic and sitting down, Margaret explained to Mark what the test was for and how it worked. 'We're going to take some blood and analyse it here. I'll be back in about forty-five minutes with the result. I understand you want two tests?'

'Ask Michael,' said Mark, detached.

Margaret's head jerked a bit too quickly towards Michael. There was something fathomless in Mark's response that she couldn't read.

'Two tests. Yes, please,' said Michael.

Sometimes shy or worried people rely on others to speak for them. Was this such a case? Margaret gave them the benefit of any doubt. 'No trouble. It will be a bit of a wait for you though. There's television and coffee. You could come back tomorrow

Mark cut her off. 'No,' he said. 'Thank you. I only have this evening.'

So he and Michael sat in the waiting area, a circle of comfortable chairs, and watched the seven o'clock news on Channel Four. On the clinic walls were A4, hand-lettered notices for social groups, aromatherapy, or stress management. Mark sat absolutely still, hypnotized by the telly. Sports results. Michael realized: he wants to find out how rugby union is going.

'Is this hard for you?' Michael asked.

'Up to a point,' Mark replied and fell silent. The silence persisted all through the sports news.

'We all miss you. Terribly. Liz, Tom, Martin, we still get together and have pub crawls along the river. The Mark Memorial Pub Crawl. We have one in summer, one in winter.'

'That's comforting.'

'Liz can't stop talking about you whenever we have one. I think she was a bit in love with you.'

'I proposed marriage.'

'Oh.'

'I thought she needed to be able to stay in the country.' Mark's smile was knife-thin and hard to read.

There had been other news since Mark's departure. 'Do you know about Rodger?' Rodger was the banker.

Mark's eyes were still fixed on football. 'No, but I imagine he died too. I imagine there's not much left of the old Exchange.'

The Angel of Death had passed over some doors as if lintels were marked. 'Harry's still with us, though.' Harry was Rodger's boyfriend who used to be tied up and left to the mercies of men who had since died. Harry was negative.

Laugh? Mark almost smiled.

The conversation was a knot. Michael suddenly thought honesty might cut it. 'Is dying very hard?' he asked.

'It's tough,' Mark said in an even voice. 'Unbearable, in fact. It's the worst thing you can know. So you seem to view it from far away. And then you don't know anything at all.'

'Is it true what everyone tells you? You float outside your body, and there's a tunnel of light?'

Mark seemed to chew over his response as if it were a plug of tobacco. On television, the news had moved on to Camilla Parker Bowles showing up in public with Charles. Mark turned to look at Michael, and there was something broken and rugged about his face, like one of those cliff faces that look human in profile. The face like a tumble of rocks seemed to ask: You really want to know?

'That happens, yes. But it's just an illusion. You are psychologically distancing yourself from what is happening. The tunnel of light is just the optic nerve closing down.'

Mark had looked healthy up until the very end. A few days before he died, his hair went snowy white, and he finally told friends the truth. This was his second bout of pneumonia, and it was by now what they had all suspected.

Michael had to go away to a conference in America. All he could do was phone. 'I want you to know how much I've always respected you,' he said.

He didn't say: I loved you, once.

He didn't say: You see, Mark, I don't ask for things. I drift into things and let them hold me, instead of me taking a grip of them. Mark, something terrible happened to me that left me completely screwed up, which is why we were never lovers. And it makes me so angry that we never were, and now never will be. Would you have lived, if we had been lovers, Mark?

It was Phil not Michael who was with Mark when he died.

Now, in the waiting room, booming music announced the end of the news.

Mark said simply: 'The world moves on.'

He reached into his bag and pulled out the newspaper, and read it carefully, the paper crinkling like tin foil when he turned the pages.