Stephen PullingerFor four gallant knights in shining armour, it was fitting that they had not only Lady Guinevere to escort round the streets of London - but also a Princess of the Realm.Stephen Pullinger

For four gallant knights in shining armour, it was fitting that they had not only Lady Guinevere to escort round the streets of London - but also a Princess of the Realm.

For nearly every step of the way in Sunday's Virgin London Marathon, four brothers, who had taken up the gauntlet to raise money in memory of their father, a respected surgeon at the Norfolk and Norwich and West Norwich hospitals, had Princess Beatrice in view.

The Camerons (aka Sir Duncan, Sir Hamish, Sir Dougal and Sir Angus) were watched by their proud mother Elizabeth, of Norwich Road, Strumpshaw, cheering them on at mile 25 on the Victoria Embankment.

Mrs Cameron said: 'Before the race they received amazing coverage on GMTV, ITV news and even US television as well as in the Evening News and EDP.

'But during the event, the eyes of the crowd were understandably on Princess Beatrice and Sir Richard Branson who were either with them or just in front of them the whole way.'

Mrs Cameron said the publicity had led to sponsorship from ex-patients, nursing staff and medical colleagues of her husband Alastair Cameron, who died after battling heart disease for 22 years.

The brothers, who came together from all parts of the country to do the race in recognition of the care their father had received in the course of seven heart attacks and two bypass operations, are confident of raising more than �10,000 for British Heart Foundation.

Showing the courage of true knights, they crossed the line with Lady Guinevere (Angus's partner Amy Jevons) in 5hr 35min, slowed by a painful knee injury carried into the race by Hamish, 34, a builder from Devon.

To see images of the knights' preparation visit www.knightrunners.org