The family of a Brazilian electrician mistakenly shot dead by British police on high alert after bombing attacks on London's transport system arrived in London on Tuesday demanding justice.

Jean Charles de Menezes, 27, was gunned down on July 22 on an underground train in south London by officers who feared he was carrying a bomb.

The incident occurred the day after four bombers failed in a bid to blow up three underground trains and a bus, and two weeks after suicide bombers killed 52 people in an identical plot.

"I came here to look for justice," said de Menezes's mother, Maria Otone de Menezes, who wept as she arrived with five other family members.

The family, whose trip has been paid for by London police, said they hoped to meet senior officers involved in the case.

"The family of Jean Charles de Menezes are visiting London this week in order to see the city where Jean Charles lived and died," lawyers for de Menezes's family said in a statement.

The electrician was shot eight times at point blank range in Stockwell station after being tailed by police who mistook him for one of those responsible for the second botched bombings.

Officers later apologized and acknowledged it was a mistake.

The shooting, and the way it was handled, brought deep embarrassment for London police and its chief, Ian Blair, who had been lauded for their investigations into the attacks.

Initial reports from police and witnesses said de Menezes had been wearing a bulky jacket, had vaulted a ticket barrier and run away when challenged by officers.

But leaked details of an initial report by the Independent Police Complaints Commission (IPCC) cast serious doubt on the claims and provoked an angry response from de Menezes's family who accused the police of lying.

Blair admitted the aftermath of the shooting had been mishandled but denied they had tried to mislead the family.

Brazil sent a team of investigators to meet detectives and the IPCC after which the ambassador to London said he had seen no evidence there had been a cover-up.

The family are due to visit Stockwell station and will meet with members of the IPCC.

PHOTO CAPTION

Matozinho Otoni da Silva, father of Brazilian Jean Charles de Menezes who was killed by British police at London's Stockwell underground station last July 22. (REUTERS)