newshound laid this down on his screen :
Police sometimes circle while using Stingray or similar to intercept criminal
or other suspect mobile phones, but they wouldn't normally do it very low. I
suppose they might have been constrained by the proximity of an airport. At
one time you could sometimes see this activity on FlightRadar but now I think
they have the option to prevent it being displayed.

Do West Yorkshire have an police aircraft, I know they have an
helicopter?