The only time I've ever needed to ring 999, I pulled over up the street, rung 999 and got through instantly. This was inside the M25.
The guy on the end wanted to know where the problem was. This was exacerbated by not only the location (a street called "The Bridge"), but also that he didn't have any fancy computers to help at all. Literally, he had to look it up on a paper map. I asked if this was usual, and he said yes. Five minutes later, he had pinpointed the location I was trying to get him towards (he didn't have GPS, but I did, so lat-long was useless, I *didn't* know where I was, but my satnav did and I reeled off the surrounding roads from the map, but he was looking them up in an index of, basically, London. When he found the street he had to find the intersection I was referring to, etc.)
By the time we'd pinpointed it, he said "Oh, they have CCTV over all that area" (couldn't work out why that mattered at all, as someone was being assaulted as we spoke).
To give him his due, by the time I hung up the phone and got back onto the road, there were sirens in the distance and I was being rung on my phone by the actual police officer in the car that was coming towards me.
The only other times I've needed to call the police has been to report a faulty traffic light (that put green on both ends of a roadworks and was incredibly dangerous). Again 10+ minutes of explaining where I was followed by "Oh, yeah, we know about that". Again, it was sorted by the time I passed the same point on my return journey.
And to get help to my ex- who'd got stuck in a broken-down car, on a motorway intersection, with no help, in deep snow, and had waited 30 minutes for the RAC to arrive. I phoned up a Scottish police number from England and they had no GPS, no way to locate things and again looked up locations on a map with my terrible Cockney accent marring all their efforts to identify local roads that I couldn't pronounce (I knew where my ex was, she texted me lat-long!). Again, within MINUTES of identifying the location, the police were on scene doing more than I'd ever expect them to do (giving RAC a right royal going over, by what I overhead on the phone, and within minutes an RAC response van had suddenly decided to prioritise the lone-stranded-woman-with-baby-in-snow-covered-car) and were great. But their operations centres need a lot of help first.
The tech is there, we're just not bloody using it. And Ofcom don't need to get involved until the police have equipment that can use that information in the first place.