We use 2.5GHz and we used to be able to fly behind (and through) buildings.
Unless you have a CAA commercial licence, in UK, the limit is 400ft above the ground directly below the drone. You can't fly within 50m of any person, property, vessel or vehicle (150m if the drone has a camera). You cannot fly within 150m of any gathering of more than 1000 people. The last one wouldn't have affected you, though

.
Also, FPV (first person view) flight can only be done with a spotter who has "line of sight" vision of the drone. Ideally, they should also be on a "buddy lead", but the law doesn't require this.
All drones over 1.5kg have to be registered with the CAA and have their registration number displayed. The pilot also needs to have passed an on-line test.
The country is also overlayed with NATS (Air Traffic Control) red, amber and green sectors. Red is no fly. Amber is fly, by with permission from CAA. green is free to fly. There isn't very much green where I live, as it's near an airport (5km exclusion zone)!! It's not too bad out in the countryside - the main problem is people. It's very easy to get within 50m of a person unintentionally. Property doesn't move - people can pop up from almost anywhere!!
Sales of drones have gone through the floor in the UK since these laws have come in. The Government really have taken the fun out of it.