The only thing he bought for himself was a magnificent leather belt with a rancher's buckle. It wasn't cheap, but he couldn't resist it.
He stopped to have lunch in a street cafe, and ate too much Argentinian roast beef while he read an out-of-date copy of The Times. Double yellow lines were to be introduced in all major British city centres. He couldn't believe his uncle Giles would have voted for that.
After lunch, with the help of his guidebook, he found the only cinema showing English-language films in Buenos Aires. He sat alone in the back row watching A Place in the Sun, fell in love with Elizabeth Taylor, and wondered how you got to meet a girl like that.
On his way back to the hotel, he dropped into a secondhand bookshop that boasted a shelf of English novels. He smiled when he saw his father's first book had been reduced to three pesos, and left after he'd purchased a much-thumbed copy of Officers and Gentlemen.
In the evening, Sebastian had dinner in the hotel restaurant and, with the help of his guidebook, selected several places of interest he still hoped to visit if he had time: the Catedral Metropolitana, the Museo Nacional de Bellas Artes, La Casa Rosada, and the Jardin Botanico Carlos Thays in the old Palermo neighbourhood. Don Pedro was right - the city had a lot to offer.
He signed the bill, and decided to return to his room and continue reading Evelyn Waugh. He would have done just that if he hadn't noticed her sitting on a stool at the bar. She gave him a coquettish smile, which stopped him in his tracks. The second smile acted like a magnet, and moments later he was standing by her side. She looked about the same age as Ruby, but much more alluring.
'Would you like to buy me a drink?' she asked.
Sebastian nodded as he climbed on to the stool next to her. She turned to the barman and ordered two glasses of champagne.
'My name is Gabriella.'
'Sebastian,' he said, offering his hand. She shook it. He'd had no idea a woman's touch could have that effect on him.
'Where do you come from?'
'England,' he replied.
'I'm going to visit England one day. The Tower of London and Buckingham Palace,' she said, as the barman poured them two glasses of champagne. 'Cheers. Isn't that what the English say?'
Sebastian raised his glass and said, 'Cheers.' He found it difficult not to stare at her slim, graceful legs. He wanted to touch them.
'Are you staying at the hotel?' she asked, placing a hand on his thigh.
Sebastian was glad the lights in the bar were so muted she wasn't able to see the colour of his cheeks. 'Yes, I am.'
'And are you alone?' she said, not removing her hand.
'Yes,' he managed.
'Would you like me to come up to your room, Sebastian?'
He couldn't believe his luck. He'd found Ruby in Buenos Aires, and the headmaster was 7,000 miles away. He didn't need to reply, because she had already slipped off the stool, taken him by the hand and was leading him out of the bar.
They headed towards a bank of lifts on the far side of the lobby.
'What's your room number, Sebastian?'
'One one seven zero,' he said, as they stepped into the lift.
When they reached his room on the eleventh floor, Sebastian fumbled with his key as he tried to open the door. She began to kiss him even before they'd stepped inside, and went on kissing him as she deftly removed his jacket and unbuckled his belt, only stopping when his trousers fell to the floor.
When he opened his eyes, he found her blouse and skirt had joined them. He wanted to just stand there and admire her body, but once again she took him by the hand, this time guiding him towards the bed. He pulled off his shirt and tie, desperate to touch every part of her at once. She fell back on the bed and pulled him on top of her. Moments later he let out a loud sigh.
He lay still for a few seconds before she slipped out from under him, gathered up her clothes and disappeared into the bathroom. He pulled the sheet over his naked body and impatiently waited for her to return. He was looking forward to spending the rest of the night with this goddess, and wondered how many times he could make love before the morning. But when the bathroom door opened, Gabriella stepped out, fully dressed, and looked as if she was about to leave.
'Was that your first time?' she asked.
'Of course not.'
'I thought so,' she said. 'But it's still three hundred pesos.'
Sebastian sat bolt upright, not sure what she meant.
'You don't think it was your good looks and English charm that persuaded me to come up to your room?'
'No, of course not,' said Sebastian. He got off the bed, picked up his jacket from the floor and took out his wallet. He stared at the remaining five-pound notes.
'Twenty pounds,' she said, obviously having come across this problem before.
He took out four five-pound notes and handed them to her.
She took the money and disappeared even more quickly than he had come.
When the plane finally touched down at London Airport, Harry took advantage of his uniform and joined the crew as they strolled unhindered through customs. He declined Annabel's offer to accompany her on the bus into London, and instead joined the long queue for a taxi.
Forty minutes later, the cab came to a halt outside Giles's house in Smith Square. Looking forward to a long bath, an English meal and a good night's sleep, Harry banged on the brass knocker, hoping Giles would be at home.
A few moments later, the door swung open, and when Giles saw him he burst out laughing, stood to attention and saluted.
'Welcome home, captain.'
When Sebastian woke the next morning, the first thing he did was to check his wallet. He only had ten pounds left, and he'd hoped to start life at Cambridge having saved eighty. As he looked at his clothes strewn across the floor, even his new leather belt had lost its allure. This morning he would only be able to visit places with no entrance charge.
Uncle Giles had been right when he'd told him there are defining moments in one's life when you learn a lot about yourself, and you deposit that knowledge in the experience account, so you can draw on it at some later date.
Once Sebastian had packed his few belongings and gathered up his presents, his thoughts turned to England, and starting life as an undergraduate. He couldn't wait. When he stepped out of the lift on the ground floor, he was surprised to see Don Pedro's chauffeur, peaked cap under his arm, standing in the lobby. He put the cap back on the moment he saw Sebastian, and said, 'Boss wants to see you.'
Sebastian climbed into the back of the Rolls-Royce, glad to have an opportunity to thank Don Pedro for all he'd done, although he wasn't going to admit that he was down to his last ten pounds. On arrival at Martinez House, he was shown straight through to Don Pedro's office.
'Sebastian, I am sorry to drag you in like this, but a small problem has arisen.'
Sebastian's heart sank as he feared he wasn't going to be allowed to escape. 'A problem?'
'I had a call from my friend Mr Matthews at the British Embassy this morning. He pointed out that you'd entered the country without a passport. I told him you'd travelled on my ship, and that while you were in Buenos Aires you were my guest, but, as he explained, that won't help you get back into Britain.'
'Does that mean I'll miss the ship?' Sebastian couldn't hide his dismay.