The Taliban have been engaged in secret talks about ending the conflict in Afghanistan in a wide-ranging ‘peace process’ sponsored by Saudi Arabia and supported by Britain, The Observer can reveal.

The unprecedented negotiations involve a senior former member of the hardline Islamist movement travelling between Kabul, the bases of the Taliban senior leadership in Pakistan, Saudi Arabia and European capitals. Britain has provided logistic and diplomatic support for the talks – despite official statements that negotiations can be held only with Taliban who are ready to renounce, or have renounced, violence.

Sources in Afghanistan confirmed the controversial talks, though they said that in recent weeks they had ‘lost momentum’. According to Afghan government officials in Kabul, the intensity of the fighting this summer has been one factor. Another is the inconsistency of the Taliban’s demands.

Although there have been low-level contacts with individual Taliban commanders at district level before, the Saudi initiative is the first attempt to talk to the Taliban leadership council based in or around the south-west Pakistan city of Quetta, known as the ‘Quetta Shura’.

The Taliban are understood to have submitted a list of 11 conditions for ending hostilities, which include demands to be allowed to run key ministries and a programmed withdrawal of western troops.