An adventurer and environmental campaigner who is trying to travel around the world in a bus powered only by chip fat has reached Asia.
Andy Pag, 34, from London, crossed from the European to the Asian side of the Istanbul Strait on Friday.
Since leaving London on September 19, he has covered more than 3,000 miles through France, Switzerland, Italy, Croatia, the Balkans and Greece to reach Turkey in the recycled scrapyard bus.
In that time he has collected more than 500 litres of chip fat and biodiesel made from used cooking oil to put in his tank.
He said: "Crossing the Bosphorus is a real milestone. I'm actually quite relieved to have made it this far, but it's only going to get tougher to find used cooking oil to fuel the bus from here on."
The journey has already had its challenges, Mr Pag said, and the bus is using more fuel than expected.
"It's a bad example of a type of bus that was never particularly efficient when new," he said. "It's noisy, uncomfortable, slow, and it smells like a bus driver's armpit, but when you are using rubbish you can't expect too much."
Ahead, he will have to contend either with the insecurity in Pakistan or the cold temperatures of the Kazakhstani winter, which risks solidifying the fuel into a greasy mess.
Mr Pag said he would make a decision on which route to take after reaching Iran.
During the journey he is reporting on how people around the world are addressing the need to use low carbon energy through his website www.biotruckexpedition.org, and has set a CO2 emission target of two tonnes for his own 12-month journey, equivalent to the sustainability targets internationally agreed on for 2050.
