What & Who discovers terrorist plots?

[davidbfpo]

The police-operated ATS Hotline after a FOI request has reported:

Calls to a dedicated police hotline rocketed by more than 600 per cent in just six months as thousands of potential leads poured in.
(Later) It received 22,729 calls in the year to the end of June 2016 - almost double the tally of 11,892 in the previous 12 months. The service took 21,596 calls from July 2016 to June 2017.

Link:http://www.independent.co.uk/news/uk...-a7897346.html

I wonder if calls to MI5 (Security Service) have also gone up.