The BBC's Peter Greste in Afghanistan said the relatively high casualty toll was partly because British forces were aggressively pushing troops out into smaller patrol bases in an attempt to drive the Taliban out.
He said the Taliban had, until recently, been forced back but had since re-grouped, resulting in daily gun battles and casualties.
Our correspondent said the 3rd Battalion The Rifles had had a "particularly rough time", losing eight men since deploying three months ago.
Meanwhile, the funeral of the 100th soldier killed during 2009 while on duty in Afghanistan took place in his home town of Bury St Edmunds in Suffolk on Wednesday.
L/Cpl Adam Drane, 23, of the Royal Anglian Regiment, was shot in Helmand Province on 7 December.
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