The official terror threat level for the UK has been raised from “substantial” to “severe” following a spate of attacks in Jewish neighbourhoods in recent weeks. The upgrading in threat level means a terror attack is “highly likely”. The Joint Terrorism Analysis Centre announced the decision on Thursday. It comes after two Jewish men were stabbed in Golders Green on Wednesday , the latest in a number of attacks in Jewish neighbourhoods in recent weeks. The suspect was named as Essa Suleiman, a 45-year-old British national born in Somalia who came to the UK legally as a child in the 1990s. Starmer visited Golders Green on Thursday (WPA Pool/Getty) Here is how the threat level system works: What does the severe rating mean? That authorities believe an attack in the UK is “highly likely”. How many levels are there? Severe is the second highest out of five, behind critical, which means an attack is expected imminently.…