Driving home from work i notice two men on off road type bikes on the pavement and a third bike with no one on it. Both men dressed in black, no helmets, balaclavas on. One looked to be looking around and noticed me watching him (in slow moving traffic) and indicated to the other i was. The first watched my car drive away, I could see in the rear view mirror and he didn't take his eyes off.
I called 101 but after ages on hold, gave up.
At the time dialling 999 seemed a bit much given I couldn't see anything happening, but now I'm wondering if I ought to have and if others would in the situation. I just had an uneasy feeling about it all.