As per my comment from a few days ago, Philips Ultinon 9000 LED bulbs are now fitted to dipped beam in my current 2012 Megane.
It’s a clean, crisp white light with a very sharp cut off. I’m entirely confident they’d pass alignment tests as part of an MOT. They’ll be added to main beam over the next couple of weeks.
I did an unofficial survey of traffic during a 210 motorway journey in the dark last night and the major offenders in terms of dazzle were older cars with out of alignment halogen lights, and Teslas seemed to be a recurrent minor irritant.

Another good reason why I much prefer steel wheels over alloys! .

Same here. No crouching trying to clean them every five minutes in winter. A quick sponge over a plastic wheel trim and it's done. They are cheap enough to replace if they corrode to a dangerous extent. But the steels on my Avensis never got that bad and they were almost twenty years old. The don't crack if hitting a large unexpected pothole and I never lost much tyre pressure.

It's been a good few years since I've been on a forecourt but I imagine the supermarkets will have the best deals compared to the main dealers so maybe some compromise has to be accepted. But good and bad cars will exist at either place, only in the last few days there was a forum member mentioning a Yaris bought from a Toyota dealer that they weren't very pleased with.

Although not really answering the OP's question, I would approach the car search process from the other angle. I would focus down on may be one or two cars that would suit and then see who has the best on offer irrespective of the retail outlet.

You need to be very careful with the airbag systems they are not a DIY repair item you could set them off which would be dangerous if your were in the car at the time.

Very sorry to hear of ORB’s departure. Let’s hope he returns; his posts were always well worth reading. When the likes of Gordon Bennett, SLO76 and now ORB leave the forum it’s a little like a friend moves away. Hopefully they’ll all be back.