Security services say they have foiled 13 major terror plots between 2013 and March this year. But despite recent efforts to regionalise and decentralise counter-terrorism operations, much of the country's security apparatus remains focused on London where special units are on standby 24/7 and authorities can rely on extensive video surveillance to quickly react.
Prestige projects, such as an expansive security system designed to protect London's financial district, have largely not been replicated in other major cities.
Elsewhere in Britain, police federations have frequently complained about a lack of resources and about their concerns over possible attacks not being taken seriously.
Most British police officers across the country do not carry firearms. The long-held tradition has recently come under mounting criticism amid a continuously high terror threat, and more officers are now being trained at using weapons.
But especially in more sparsely populated areas, police federations have argued that training efforts are proceeding too slowly and that the few armed officers available would likely arrive at the scene of an attack too late.
Others say that armed officers alone would hardly stop militants from using explosives and that the problems are much more deeply rooted. Britain's counter-radicalisation programme, Prevent, has frustrated many in cities such as Manchester in the past by focusing on what critics say amounts to a monitoring and surveillance of Muslims.
The programme aims to identify young people who might be prone to radicalisation, and to provide them with counselling and social support.
"But one main problem was always that the programme was initiated and led by the police," Peter Neumann, the director of London's International Centre for the Study of Radicalisation and Political Violence, said in an interview conducted prior to the attack. "Among many Muslims, that created the perception that they were not treated as normal citizens, but rather as security threats."
In some cities, the flaws of governmental counter-radicalisation programmes have been more obvious than in others and in some cases, the criticism has also come from the authorities themselves.
In 2015, the chief constable of Greater Manchester police, Sir Peter Fahy, harshly criticised plans by then-Prime Minister David Cameron and Home Secretary Theresa May which included the shutdown of mosques or a funding stop for charities accused of collaborating with possible extremists.
Voicing his opposition to the plans at the time, Fahy said: "It draws the police in[to] areas the public will be uncomfortable with if they feel that it erodes free speech or religious freedom or the right to protest. At what point do you erode the British values you are trying to protect. Such as live and let live, and freedom of speech."
In the same interview, Fahy also confirmed that his Manchester force would be hit by severe staff cuts - something police federations had warned would hinder police forces' ability to respond to attacks and other incidents in the future.