Mr Ottaway said more than 90 veterans had applied for the trip.
However, 40 withdrew after considering the difficulty of the journey.
One of those is the last-surviving pilot from the Dambusters raid in Germany in 1943, Les Munro. The Herald understands that the other applicants failed to pass a medical assessment.
Disappointed veterans and their families have the consolation of being able to attend a New Zealand ceremony to acknowledge their service.
One of the men going to London is former navigator Harold "Bunny" Burrows, 92, who lives in Auckland.
"I'm looking forward to it," he said.
"It will be good for the Bomber Command boys because they took a terrible beating.
"Of the 20 men I started operations with, only two were still flying at the end of the war. I was lucky."
Mr Burrows said he was "not agile but fit enough" for the trip and its demands, which will include the ceremony to inaugurate the $12 million memorial, which New Zealanders helped to pay for, a reception at the New Zealand High Commission and a Lord Mayor's dinner for Bomber Command veterans.
The Government refused to include the dozen living members of Britain's Royal Air Force who flew with New Zealanders as flight engineers and who later became New Zealand citizens.
One of them, Aucklander Doug Williamson, was told he did not qualify despite flying 32 missions with New Zealand bomber crews.
He told the Herald he was fit and would have liked to be part of the official bomber memorial ceremony to represent his crew who were no longer alive.
- Staff reporter
