Ms Homer, now chief executive of the Revenue and Customs, said there had been problems with the "transition" to the new unit in 2011 but the organisation had got better at responding to correspondence and asylum cases were being dealt with properly.

BBC: The UK Border at Heathrow

It planned a march to Whitehall on Monday afternoon, to demand the resignation of HM Revenue and Customs' chief executive, Dave Hartnett.

BBC: St Paul's camp: Occupy London is 'tourist attraction'

David Cohen, former Chief of Staff to Director Ray Kelly, U.S. Customs Service.

CENTERFORSECURITYPOLICY: 2006/07 Winter National Security Academy