Online jihadist propaganda attracts more clicks in Britain than in any other European country and the main internet companies are failing to curb it, a centre-right thinktank has said.

Policy Exchange analysts have said that Islamic State is still producing, at a conservative estimate, about 100 items of new content each week, including execution videos and bomb-making instructions, despite big military defeats in Iraq and Syria.

The report, the NewNetwar, says the jihadist online "ecosystem", the core of which is rooted in the Telegram app, has tentacles across hundreds of different domains. It is resilient and reaches an audience of, at minimum, tens of thousands, including large numbers of users in the UK.

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