The Daily Mail recycle this story regularly. He is one from Feb 2008
http://www.dailymail.co.uk/news/article-513598 /RAF-surveillance-planes-hear-Taliban-fighters -talking-Brummie-Yorkshire-accents.html
"Shoot them!" is the cry. That is exactly what we have been trying to do to the Taleban fighters for 7 years. I am sure there have been British Taleban fatalities already in this war. Death does not seem to deter them.
Perhaps they could start by tightening up the free and easy route between the UK and Pakistan.
Perhaps not. There are several million law abiding British people with family in Pakistan. How would restricting their travel stop the youths answering the call of jihad? They are determined, they would get to Afghanistan by other means
The assumption in your question is that they are entering through Pakistan, but there is at least some attempt at border control between Afghanistan and Pakistan, unlike the free passage of holy fighters from the Iranian border with Afghanistan.
The British Jihadists are brainwashed, fanatical and secretive. It is very difficult to counter that fervor.
Unfortunately, there have been no high profile prosecutions of the British men captured in Afghanistan which might act as a deterrent, and make family members more vigilant of their young sons.
Ruhal Ahmed, one of the Tipton 3 has admitted being in Afghanistan, attending an Islamist training camp, and weapons training, but has not faced prosecution on his return.
Quietly forgetting about these indiscretions, and giving the message that their is no consequences for their actions, is the biggest failure.