I think most airfields are quiet compared to Heathrow! Is radar not simply a tool to speed things up, as well as being a safety feature as a bonus. Many years ago I had reason to visit some airports way up north of Scotland when I was employed in the oil industry, I remember there was no radar in those airfields at all. I'm sure it has changed since but at the time it was a perfectly safe and normal way to get on the ground.
I see Aldergrove appear to have been doing Harbour radar over the last few days, looking at the tracks of the arrivals on Flight Radar I think a procedural approach would have been quicker in some cases! Some of the routings are interesting to put it mildly.
