Britain's military is not structured to maintain significant presences in two countries at once, as is currently the case, the head of the country's armed forces said in comments reported Wednesday.

Speaking to reporters in London a day earlier, Sir Jock Stirrup, the air chief marshal and chief of the defence staff, said that Britain's military was "very stretched" with thousands of troops in both Iraq and Afghanistan.

"We are not structured or resourced to do two of these things on this scale on an enduring basis but we have been doing it on an enduring basis for years," Stirrup said in the comments reported by The Daily Telegraph and other British newspapers.

"Until we get to the stage when one of them comes down to small scale, we will be stretched beyond the capabilities we have.

"That is not what we are structured for, nor is it what we plan for. We are very stretched at the moment. Until we get down to one operation at this scale, we are always going to be stretched."

Britain currently has around 7,800 soldiers based in Afghanistan, a figure soon set to rise to 8,000, and a further 4,000 in Iraq.