British-born extremists are reaching terror cells in Syria by joining holiday-makers on budget flights to sun-kissed Cyprus.
They're then handing over as much as £1,000 (roughly $1,500) to local fishermen in the Turkish-controlled north of the country to be sailed across the water to the war-torn Middle Eastern state, arriving in the dead of night.
The route is now so well trodden that it is easier than ever for jihadis in the UK to join ISIS (Daesh) militants fighting across the country and in Iraq.
A source told The Mirror: "It's difficult to put firm numbers on it – I'd estimate many dozens of people from the UK have used this route to reach the caliphate."
The Government last week announced plans to increase their efforts to stop people leaving the UK to join Islamic State militants.
However, through these so called 'ISIS travel agents', the trip to Syria is as simple to organise as booking a package holiday.
A fixer in northern Cyprus organises everything, communicating by text and receiving cash only payments.
Posing as tourists, the extremists book flights on budget airlines including the likes of EasyJet and Ryanair to the holiday favourite Greek island.
They're put up in cheap local digs before their fixer over the border in Famagusta organises their sea crossing, which departs from the fishing port of Bogaz.
Well-placed sources say as many as 30 are involved, and after dropping off their militant cargo then go straight into fishing, to keep up a false pretence that they're just simple fishermen out working.
One boat skipper explained that getting past border control at any stage of the journey is simple - because the jihadists have EU passports.
He said: "They appear just like the tourists who come across the border."
"There is usually three or four of the British Jihadists at a time."
Anti-terror cops say almost 800 people from the UK have travelled to support IS and other terror groups - with half already back in the country.
However, Birmingham MP Khalid Mahmood argued almost a year ago that the number even then was closer to 2,000.
Security expert George McKillop said: "Those determined enough will always use their ingenuity to find innovative ways to breach controls."
"As with any form of security, it is essential that every effort is made to identify loopholes before they are exploited."
"This means ongoing innovative thinking by those charged with policing borders."
By Euan Mclelland
