'Anyone who has read Mr Clifton's moving words in his book The Diary of a Convict, knows how he ended up serving in the US Army, where he won the Silver Star before being badly wounded by a German landmine only weeks before peace was declared. But the Germans couldn't kill off Harry Clifton quite that easily, my lords, and neither should we.'

The Labour benches erupted as one, and Lord Preston waited until the House had fallen silent once again.

'Finally, my lords, we should ask ourselves why we are here today. I will tell you why. It is because Giles Barrington is appealing against a judgment made by the seven leading legal minds in the land, something else Lord Harvey failed to mention in his heartfelt speech. But I will remind you that, in their wisdom, the Law Lords came down in favour of Harry Clifton inheriting the baronetcy. If you are thinking of reversing that decision, my lords, before you do so, you must be certain that they have made a fundamental error of judgment.

'And so, my lords,' said Preston as he began his peroration, 'when you cast your votes to decide which of these two men should inherit the Barrington title, do not base your judgment on convenience, but on strong probability. Because then, to quote Lord Harvey, you will give the benefit of the doubt not to Giles Barrington, but to Harry Clifton, as the odds, if not the pedigree, are stacked in his favour. And may I conclude, my lords,' he said, staring defiantly at the benches opposite, 'by suggesting that when you enter the division lobby, you should take your consciences with you, and leave your politics in the chamber.'

Lord Preston sat down to loud acclamation from his own benches, while several peers on the opposite side of the House could be seen nodding.

Lord Harvey wrote a note to his opponent, congratulating him on a powerful speech that was made even more persuasive by its obvious conviction. Following the tradition of the House, both opening speakers remained in their places to listen to the views of fellow members who followed them.

There turned out to be several unpredictable contributions delivered from both sides of the House, which only left Lord Harvey even more unsure what the outcome would be when the votes were finally cast. One speech that was listened to with rapt attention from all quarters of the chamber was delivered by the Bishop of Bristol, and was clearly endorsed by his noble and ecclesiastical friends, who sat on the benches beside him.

'My lords,' said the bishop, 'if, in your wisdom, you vote tonight in favour of Mr Giles Barrington inheriting the title, my noble friends and I would be left with no choice but to withdraw the church's objection to a lawful marriage taking place between Mr Harry Clifton and Miss Emma Barrington. Because, my lords, were you to decide that Harry is not the son of Hugo Barrington, there can be no objection to such a union.'

'But how will they vote?' Lord Harvey whispered to the colleague sitting beside him on the front bench.

'My colleagues and I will not be casting a vote in either lobby when the division is called, as we feel we are not qualified to make either a political or a legal judgment on this issue.'

'What about a moral judgment?' said Lord Preston, loud enough to be heard on the bishops' benches. Lord Harvey had at last found something on which the two of them were in agreement.

Another speech that took the House by surprise was delivered by Lord Hughes, a cross-bencher and a former president of the British Medical Association.

'My lords, I must inform the House that recent medical research, carried out at the Moorfields Hospital, has shown that colour-blindness can only be passed down through the female line.'

The Lord Chancellor opened his red folder and made an emendation to his notes.

'And therefore, for Lord Preston to suggest that because Sir Hugo Barrington was colour-blind, it is more likely that Harry Clifton is his son, is bogus, and should be dismissed as nothing more than a coincidence.'

When Big Ben struck ten times, there were still several members who wished to catch the Lord Chancellor's eye. In his wisdom, he decided to allow the debate to run its natural course. The final speaker sat down a few minutes after three the following morning.

When the division bell finally rang, rows of dishevelled and exhausted members trooped out of the chamber and into the voting lobby. Harry, still seated in the gallery, noticed that Lord Harvey was fast asleep. No one commented. After all, he hadn't left his place for the past thirteen hours.

'Let's hope he wakes up in time to vote,' said Giles with a chuckle, which he stifled as his grandfather slumped further down on to the bench.

A badge messenger quickly left the chamber and called for an ambulance, while two ushers rushed on to the floor of the House and gently lowered the noble lord on to a stretcher.

Harry, Giles and Emma left the visitors' gallery and ran down the stairs, and reached the peers' lobby just as the stretcher bearers came out of the chamber. The three of them accompanied Lord Harvey out of the building and into a waiting ambulance.

Once members had cast their votes in the lobby of their choice, they slowly made their way back into the chamber. No one wanted to leave before they'd heard the result of the count. Members on both sides of the House were puzzled not to see Lord Harvey in his place on the front bench.

Rumours began to circulate around the chamber, and when Lord Preston was told the news, he turned ashen-white.

It was several more minutes before the four whips on duty returned to the chamber to inform the House of the result of the division. They marched up the centre aisle in step, like the guards officers they had been, and came to a halt in front of the Lord Chancellor.

A hush descended on the House.

The chief whip raised the voting slip and declared in a loud voice, 'Contents to the right, two hundred and seventy-three votes. Non-contents to the left, two hundred and seventy-three votes.'

Pandemonium broke out in the chamber and in the gallery above, as members and visitors sought guidance as to what would happen next. Old hands realized that the Lord Chancellor would have the casting vote. He sat alone on the Woolsack, inscrutable and unmoved by the noise and clamour all around him as he waited patiently for the House to come to order.

Once the last whisper had died away, the Lord Chancellor rose slowly from the Woolsack, adjusted his full-bottomed wig and tugged the lapels of his black and gold-braided robe, before he addressed the House. Every eye in the chamber was fixed upon him. In the packed gallery overlooking the chamber, those who had been fortunate enough to acquire a ticket leant over the railings in anticipation. There were three empty seats in the distinguished guests' gallery: those of the three people whose future the Lord Chancellor held in his gift.

'My lords,' he began. 'I have listened with interest to each and every contribution your lordships have made during this long and fascinating debate. I have considered the arguments so eloquently and so passionately delivered from all parts of the House and find myself facing something of a dilemma. I would like to share my concerns with you all.

'In normal circumstances, being presented with a tied vote, I would not hesitate to support the Law Lords in their earlier judgment, when they came down in favour by four votes to three, of Harry Clifton inheriting the Barrington title. Indeed, it would have been irresponsible of me not to do so. However, your lordships may not be aware that just after the division was called, Lord Harvey, the proposer of the motion, was taken ill, and therefore unable to cast his vote. None of us can be in any doubt which corridor he would have entered, ensuring that he would have won the day even if it was by the slimmest of margins, and the title would therefore have passed to his grandson Giles Barrington.