But travellers bound for London should be aware their travel insurance may not cover their decision to cancel an upcoming trip in light of the terror attack, Travel Insurance Direct's travel expert Phil Sylvester said.
"Clearly people about to travel to the UK will be concerned by what's occurred and weighing up their options: do they go or not?" he said.
"There are some events that, although 'unforeseen', have limited cover under your policy or are not covered at all, and a terrorist attack falls under this.
"We will do everything in our power to assist policyholders involved in this current incident, but going forward, for future visitors, there is no cover for cancellation [of travel plans] or additional expenses due to delay.
"This is because it is impossible for us to estimate the eventual cost of a large scale terror incident, so to keep premiums down for everyone at all other times we exclude such events."
Sylvester said Travel Insurance Direct would cover medical expenses and medical evacuation costs due to injury for policyholders involved directly in the London event.
Affected customers are urged to call their insurer's emergency assistance team right away.