London, July 1 : International Security Advisor to the Prime Minister Gordon and former Metropolitan Police Commissioner, Sir John Stevens, has warned that Britain will be vulnerable to terrorist attack for another three decades.
Tory leader David Cameron will today unveil the study from Lord Stevens of Kirkwelpington, which will criticise the Government for a "lack of a clear border security strategy".
His report, which was commissioned by the Conservatives, will say there is "no indication that the terrorist threat level will reduce significantly" for "at least 20 to 30 years."
Stevens warns that there is a lack of top level communication between agencies, The Telegraph reported.
"The lack of a clear border security strategy has resulted in a situation where agencies are unaware of where their shared priorities lie," he said.
"This has resulted in key duties not being carried out, resources not properly allocated, organisations not working together as they should and focus being placed on narrow border control issues, specific to each agency and not the overall border security picture of the UK."
Lord Stevens' report "Border Protection Service for the UK: Policy Proposals" highlights some of the threats to the UK's border security, including fears that it is now easier to enter the UK's airspace by light aircraft.
There are many small airfields within easy flying distance of continental Europe, thereby facilitating the movement of people or illicit goods, it said.
Lord Stevens said: "There is no doubt more attacks will be attempted against the UK and those involved are again likely to travel abroad for preparation. Others may travel to the UK for the sole purpose of carrying out attacks."
His warning comes after the Government's terrorism adviser Lord Carlile of Berriew QC warned that private jets and light aircraft could be used by terrorists to launch attacks on crowds and buildings in Britain.