Asked about the background of Brexit, Mr Basu told the BBC:

there was no intelligence pointing to an increased level of attacks after Brexit, but added: "What's most concerning me... is its potential to divide communities and set communities against each other."

But the loopy left also poses a threat!
Britain’s most dangerous export: Corbynism. From Europe's premium policy intelligence service

https://www.politico.eu/article/jeremy-corbyn-left-uk-europe-britains-most-dangerous-export-corbynism/