The Henry Jackson Society has release a report, Islamist Terrorism: Analysis of offences and Attacks in the UK (1998-2015). The report is pricey, but there is a summary at

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And, when you didn’t sleep well because cats were bonking on your roof all night, and your shotgun blast that ended their night of love also put holes in the galvanizes iron, well just cut and paste: “There were 264 convictions as a result of arrests between 1998 and 2015 involving 253 British or foreign nationals as well as five suicides as a result of attacks on British soil – data relates to a base total of 269 individual offences collectively referred to as Islamism-related offences (IROs). IN BRIEF Place of residence at date of arrest East London was home to half of London-based offenders (22% overall), the most common boroughs being Tower Hamlets, Newham and Waltham Forest Hall Green and Hodge Hill constituencies contain three-quarters of all Birmingham based offenders (11% overall) London- and Birmingham based individuals are pre-dominant among offenders = 72% offences 43% 18% London West Midlands North West England 10%.”

Surprise, surprise, Islamic terrorism is the principal terrorism threat. Tell that to Sweden.