How is the security situation in London, UK?

In general, most of the old capitalist countries have very good public security, and the same is true in London. The daily security office is very good. However, although London is usually fine, it does have major hidden dangers, that is, the huge immigrant group and terrorist attacks. It belongs to the kind of "either do nothing or do something absolutely". London has a large number of immigrants from the Arab world, the former socialist Eastern European countries and the South Asian subcontinent. The areas where they live are dirty and messy. Some foreign tourists and law-abiding immigrants such as Chinese will be subject to possible abuse, so remember to stay away if you go there. Those areas; and be careful when taking the subway. The London subway bombing in 2007 was caused by a Pakistani immigrant from Al Qaeda.