London, Aug 6 (DPA) The presidential elections in Afghanistan later this month will be 'very challenging' but measures are in place to 'mitigate' threatened disruption from Taliban forces, Britain's ambassador to Kabul said Wednesday.

Mark Sedwill, speaking via videolink to a briefing at the Foreign Office in London, said the recent increased fighting in Helmand province in southern Afghanistan had guaranteed that about 70 percent of the people there would be able to vote.

'The circumstances are very challenging and we have to recognise that these elections are going to be pretty rough and ready in places,' said Sedwill.

Between 15 and 17 million Afghans are registered to vote in the Aug 20 poll.

Sedwill said he believed that fewer Afghans would vote this year, compared with the previous election in 2004, but said this was a normal pattern in countries that had undergone internal conflict.