Taken from CTC's Sentinel an article by Raffaello Pantucci; the Abstract says:
While clearly at the top of the Islamic State’s targeting list, the United Kingdom so far has been spared from any major terrorist atrocities at home with direct links to the Islamic State. A review of the trials of those accused of terrorist plotting in the country between 2013 and 2015 reveals that the violent Islamist threat picture has instead been dominated by lone-actor plots, with some demonstrating connections of some sort to individuals on the battlefield in Syria or Iraq. Going forward, however, the threat is likely to become more acute as the Islamic State pivots toward international terror.
Link:https://www.ctc.usma.edu/posts/the-i...-terror-trials