Published Monday, 14 February 2011
The threat level during London 2012 is expected to be at "severe" but a review spearheaded by Security Minister Baroness Neville-Jones means there is "a wider understanding of the dynamics" needed for security planning.
Between 1993 and 1994 Baroness Neville-Jones was chairman of the Joint Intelligence Committee.
Mr Robertson said security planning for the Games was appropriate for the changing types of threat that have to be considered.
He noted: "Two years ago, probably 18 months out, nobody saw the rise of dissident republicanism that we are probably facing in Ireland.
"It is a threat to the Games."
He added: "We have much better appreciation now of precisely what is required to keep these Games secure than we did 18 months ago."
The Olympic safety and security budget, set in 2007, remains at £600m but officials feel that continuing savings could see £475m of that being used.
The £9.3bn Olympic project still remains in budget.
Responsibility for venue security is split between London 2012 and the Government.
The Treasury is currently considering a bid from PSNI Chief Constable Matt Baggott for more money from the Contingency Fund to supplement the region's police budget over the next four years in order to deal with the threat in Northern Ireland.
Stormont justice minister David Ford has backed the call.