But he did accept that there was "tension" among Nato member states, eager to set a timetable for withdrawal.

BBC: Nato 'impatient' for Afghan progress

The dispute comes against a background of tension between the royal colleges and PMETB, which was set up in 2005 by the government, to which it reports.

BBC: Top doctors 'not ready for posts'

The third set progressed at a rapid pace with the tension ratcheting up a notch as each game passed, and Federer had the first chance but could not capitalise on a set point in game 10.

BBC: Robin Soderling stuns Roger Federer at French Open