At least 56 people died in the July 7 attacks on underground trains and a bus.
“We are all working together to have high visibility patrols both on the overground mainline stations and down on the Tube system,” said Deputy Chief Constable Andy Trotter, speaking to BBC Radio.
“We are out there to reassure Londoners and also to deter any further attacks,” he said.
London remains on a high state of alert, despite the full reopening of the Piccadilly underground line, described as a major step back to normal operations.
Transport officials said underground train passengers have dropped by up to 15 percent on weekdays and up to 30 percent on weekends.
London police have warned of “very real” threats of further attacks by other militant cells.
This comes after British police filed the first charges against a suspect in relation to the failed July 21 bombings in London.
Ismael Abdurahman, 23, of Kennington in south-east London, will appear before the Bow Street Magistrates’ Court on Thursday, charged under the Terrorism Act with withholding information that may have helped catch a person involved in terrorism.
He was the first to be charged as part of the investigation, however is not one of the four men suspected of trying to set off bombs.
Police believe all four are in custody, three in the UK and one in Rome.
The four are accused of carrying out the operation, which back-fired after their bombs apparently failed to explode properly.
The British authorities are holding a total of 15 people in custody in relation to the attacks, and are seeking the extradition of prime suspect Hamdi Issac from Italy.
Meanwhile Zambia officially announced it would deport Haroon Aswat, the alleged mastermind behind London’s first attacks on July 7, who was arrested in the capital Lusaka two weeks ago.
Mr Aswat, 31, has been named in US and British media reports as the suspected ringleader behind western Europe’s first-ever suicide bombings.