He looked back down at the Guide again and flipped through a few likely locations. He suddenly laughed, and then rummaged in his satchel again.

He pulled out a small memory dump module, wiped off the fluff and biscuit crumbs, and plugged it into an interface on the back of the Guide.

When all the information that he could think was relevant had been dumped into the module, he unplugged it again, tossed it lightly in the palm of his hand, put the Guide away in his satchel, smirked, and went in search of the ship’s computer data banks.

“The purpose of having the sun go low in the evenings, in the summer, especially in parks,” said the voice earnestly, “is to make girl’s breasts bob up and down more clearly to the eye. I am convinced that this is the case.”

Arthur and Fenchurch giggled about this to each other as they passed. She hugged him more tightly for a moment.

“And I am certain,” said the frizzy ginger-haired youth with the long thin nose who was epostulating from his deckchair by the side of the Serpentine, “that if one worked the argument through, one would find that it flowed with perfect naturalness and logic from everything,” he insisted to his thin dark-haired companion who was slumped in the next door deckchair feeling dejected about his spots, “that Darwin was going on about. This is certain. This is indisputable. And,” he added, “I love it.”

He turned sharply and squinted through his spectacles at Fenchurch. Arthur steered her away and could feel her silently quaking.

“Next guess,” she said, when she had stopped giggling, “come on.”

“All right,” he said, “your elbow. Your left elbow. There’s something wrong with your left elbow.”

“Wrong again,” she said, “completely wrong. You’re on completely the wrong track.”

The summer sun was sinking through the tress in the park, looking as if—Let’s not mince words. Hyde Park is stunning. Everything about it is stunning except for the rubbish on Monday mornings. Even the ducks are stunning. Anyone who can go through Hyde Park on a summer’s evening and not feel moved by it is probably going through in an ambulance with the sheet pulled over their face.

It is a park in which people do more extraordinary things than they do elsewhere. Arthur and Fenchurch found a man in shorts practising the bagpipes to himself under a tree. The piper paused to chase off an American couple who had tried, timidly, to put some coins on the box his bagpipes came in.

“No!” he shouted at them, “go away! I’m only practising.”

He started resolutely to reinflate his bag, but even the noise this made could not disfigure their mood.

Arthur put his arms around her and moved them slowly downwards.

“I don’t think it can be your bottom,” he said after a while, ” there doesn’t seem to be anything wrong with that at all.”

“Yes,” she agreed, “there’s absolutely nothing wrong with my bottom.”

They kissed for so long that eventually the piper went and practised on the other side of the tree.

“I’ll tell you a story,” said Arthur.

“Good.”

They found a patch of grass which was relatively free of couples actually lying on top of each other and sat and watched the stunning ducks and the low sunlight rippling on the water which ran beneath the stunning ducks.

“A story,” said Fenchurch, cuddling his arm to her.

“Which will tell you something of the sort of things that happen to me. It’s absolutely true.”

“You know sometimes people tell you stories that are supposed to be something that happened to their wife’s cousin’s best friend, but actually probably got made up somewhere along the line.”

“Well, it’s like one of those stories, except that it actually happened, and I know it actually happened, because the person it actually happened to was me.”

“Like the raffle ticket.”

Arthur laughed. “Yes. I had a train to catch,” he went on. “I arrived at the station…”

“Did I ever tell you,” interrupted Fenchurch, “what happened to my parents in a station?”

“Yes,” said Arthur, “you did.”

“Just checking.”

Arthur glanced at his watch. “I suppose we could think of getting back,” he said.

“Tell me the story,” said Fenchurch firmly. “You arrived at the station.”

“I was about twenty minutes early. I’d got the time of the train wrong. I suppose it is at least equally possible,” he added after a moment’s reflection, “that British Rail had got the time of the train wrong. Hadn’t occurred to me before.”

“Get on with it.” Fenchurch laughed.

“So I bought a newspaper, to do the crossword, and went to the buffet to get a cup of coffee.”

“You do the crossword?”

“Yes.”

“Which one?”

“The Guardian usually.”

“I think it tries to be too cute. I prefer The Times. Did you solve it?”

“What?”

“The crossword in the Guardian.”

“I haven’t had a chance to look at it yet,” said Arthur, “I’m still trying to buy the coffee.”

“All right then. Buy the coffee.”

“I’m buying it. I am also,” said Arthur, “buying some biscuits.”

“What sort?”

“Rich Tea.”

“Good choice.”

“I like them. Laden with all these new possessions, I go and sit at a table. And don’t ask me what the table was like because this was some time ago and I can’t remember. It was probably round.”

“All right.”

“So let me give you the layout. Me sitting at the table. On my left, the newspaper. On my right, the cup of coffee. In the middle of the table, the packet of biscuits.”

“I see it perfectly.”

“What you don’t see,” said Arthur, “because I haven’t mentioned him yet, is the guy sitting at the table already. He is sitting there opposite me.”

“What’s he like?”

“Perfectly ordinary. Briefcase. Business suit. He didn’t look,” said Arthur, “as if he was about to do anything weird.”

“Ah. I know the type. What did he do?”

“He did this. He leaned across the table, picked up the packet of biscuits, tore it open, took one out, and…”

“What?”

“Ate it.”

“What?”

“He ate it.”

Fenchurch looked at him in astonishment. “What on Earth did you do?”

“Well, in the circumstances I did what any red-blooded Englishman would do. I was compelled,” said Arthur, “to ignore it.”

“What? Why?”

“Well, it’s not the sort of thing you’re trained for is it? I searched my soul, and discovered that there was nothing anywhere in my upbringing, experience or even primal instincts to tell me how to react to someone who has quite simply, calmly, sitting right there in front of me, stolen one of my biscuits.”

“Well, you could…” Fenchurch thought about it. “I must say I’m not sure what I would have done either. So what happened?”

“I stared furiously at the crossword,” said Arthur. “Couldn’t do a single clue, took a sip of coffee, it was too hot to drink, so there was nothing for it. I braced myself. I took a biscuit, trying very hard not to notice,” he added, “that the packet was already mysteriously open…”

“But you’re fighting back, taking a tough line.”

“After my fashion, yes. I ate the biscuit. I ate it very deliberately and visibly, so that he would have no doubt as to what it was I was doing. When I eat a biscuit,” Arthur said, “it stays eaten.”

“So what did he do?”

“Took another one. Honestly,” insisted Arthur, “this is exactly what happened. He took another biscuit, he ate it. Clear as daylight. Certain as we are sitting on the ground.”

Fenchurch stirred uncomfortably.

“And the problem was,” said Arthur, “that having not said anything the first time, it was somehow even more difficult to broach the subject the second time around. What do you say? ‘Excuse me… I couldn’t help noticing, er…’ Doesn’t work. No, I ignored it with, if anything, even more vigour than previously.”