[user104658]

Originally Posted by Northern Monkey

Well British Tornados have just destroyed an oil field which was a known source of income for IS.So that undoubtedly has a positive effect.

Not undoubtedly. WHEN the destruction of the oilfield can be shown to have had a meaningful impact on ISIS numbers or operations then it will be undoubted. As it stands there are plenty of analysts who don't think it has had the intended or hoped for effect.