From the evening of 3 June until midday on 5 June, during the presence of President Trump, GNSS users near London were warned of possible loss of satellite signals.
A Notice to Airmen (NOTAM) warned that jamming could be centred within 2 NM of 513013N 0000812W - just down The Mall from Buckingham Palace. It stated that it could affect aircraft within 11 NM up to, or above, 40,000 ft - but would not exceed 15 minutes at any one time.
Within the detail, stated effective ranges seem much less: 1.5 NM at 433-915 MHz and
1.1 NM at 2.4-5.8 GHz.
The NOTAM concludes ‘Some electronic situational awareness devices and unmanned aircraft systems’ (UAS) command & control (C2) systems may suffer intermittent/total failure or give incorrect notification.’