Foreign Secretary Boris Johnson is visiting the British territories devastated by the hurricane.
So far, the BBC reports, around 900 United Kingdom troops, 50 police and more than 20 tonnes of aid have been sent to the affected British territories, which are self-governing but rely on the United Kingdom for defence and security and for protection against natural disasters.
Communications are mostly still down in the British Virgin Islands where its premier, Orlando Smith, has called for a "comprehensive economic package for reconstruction" from the UK.
President Trump issued a major disaster declaration for the US Virgin Islands following Hurricane Irma.
"But hundreds of dedicated British public servants are doing their utmost to help, and they will not relent in their efforts".
Irma caused about $13 billion in destruction across the Caribbean before it hit the USA, according to an estimate from the Germany-based Center for Disaster Management and Risk Reduction Technology, a damage assessor, which would make it the most expensive storm in the region's history.
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Some 70 per cent of the beds at the main hospital in the French portion of the island were severely damaged, and more than 100 people in need of urgent medical care have been evacuated. "Many foreigners have been willing to provide their own assistance at their cost, only to be denied - shame on you Queen Elizabeth, et al, for not allowing these people, whom you depend upon for tourism dollars, illegal shell corporations, and tax evasion to sustain this economy", Haynes writes.
Liberal Democrat leader Sir Vince Cable said: "The action of other governments puts Theresa May's response in sharp relief".
Branson and his company are looking to plant seeds in the recovery effort by tasking his foundation, Virgin Unite, to coordinate aid and supplies in the short term and reconstruction efforts in the months ahead, Branson wrote. But that wasn't the case for the surrounding area or the rest of 74-acre Necker Island, his property for four decades.
She described the aftermath as a "crisis on British soil", adding: "I have not heard about any government evacuation plans, which should surely be a priority".
Dozens of people were killed as Irma left a trail of destruction across the Caribbean, leaving thousands homeless and causing billions of pounds of damage.
Seven hundred soldiers, 50 police officers and 20 tonnes of aid have already been sent.
Another Royal Navy ship, the HMS Ocean, is set to arrive in the Caribbean within days. "There was looting and locals were getting violent because of a shortage of supplies".