In the UK there is some oversight by the parliamentary committee and also the courts. Here's a case where the courts say that police surveillance was not corre

In the UK there is some oversight by the parliamentary committee and also the courts. Here's a case where the courts say that police surveillance was not correctly authorised: https://www.bailii.org/uk/cases/UKIPTrib/2018/IPT_17_93_H.html https://www.bailii.org/uk/cases/UKIPTrib/2018/IPT_17_93_H.ht...