Bush is the first US president to have a state visit to the UK since Woodrow Wilson in 1918, which means he is officially invited by the Queen and stays at Buckingham Palace.

During his visit to the UK, Bush wants to offer his prayers and tell the bereaved families their loved ones did not die in vain.

But Reg Keys, who lost his 20-year-old son Tom in June 2003, said he holds Bush and Tony Blair responsible for his death.

"I don't know how the man (Bush) has the nerve to show his face in his country after costing the lives of 53 British servicemen," said Mr Keys, of Llanuwchllyn, near Bala.

Tom Keys died days before his 21st birthday.

He was one of six military policemen shot dead in Al Majar al-Kabir last June.

The servicemen were chased into a police station and shot.

The British Army said all the deaths were murder.

Keys said other nations had the "backbone" to stand up to waging war on Saddam Hussein.

Keys said: "I haven't had an invitation for an interview with Mr Bush, if I did I would literally walk from Wales to London to meet the man, look him in the eye and tell what I think of him.

"They didn't die for a noble cause, they died for Bush's political reasons, they were just sacrificial lambs."

Keys has demanded to know why his son and his fellow officers did not have back-up.

And the acting rector Heather Fenton of the family's local church, St Deiniol's, has said the circumstances must make it harder for the family to come to terms with the death.