British troops were twice as likely to be killed in Afghanistan as US forces

Exclusive: Costs of War study looked at losses suffered by Nato allies over 2001-17, finding UK lost 455 lives

British and Canadian troops were more than twice as likely to get killed in Afghanistan as their US counterparts, according to a study that looks at the scale of the sacrifice made by Nato allies over the course of the 20-year war.

The UK also gave more to Afghanistan than the US in the form of economic and humanitarian assistance as a percentage of GDP, the study published on Wednesday by the Costs of War project at Brown University found.