I would ask "Why not drive up to London on the Motorway instead?"
They would reply that they weren't interested in London, "It was pretty overrated".
Now, with the decline in Public Transport in that country, they use their cars a lot more.
Dunno about "overrated", but London traffic is as bad as anywhere I have ever been.
I made the serious mistake of driving across London one weekday.
Now I understand why they have that big peripheral ring highway.
It is probably faster to drive several km out to the M25 than to try to drive through downtown.
It was challenging enough for this Yankee driver to drive on the "wrong" side of the road.
But it was made even worse by the nearly complete lack of signage.
London (and England and Europe, for that matter) are notorious for lack of street signs.
You are lucky if you can spot a placcard on the corner of a building (if they even have them).
And all the traffic flow information (left two lanes for Croydon, etc.) is painted on the pavement.q
So, in heavy traffic you have zero opportunity to even see it, much less comprehend it in time to change lanes.
The "Southampton-items" had quite a peculiar attitude to London.
It may well have gone by now, as the "Gen X" & "Millenials" are probably less set in their ways.
It is many years since I drove in London, but I remember getting caught with one of those illuminated "One Way" signs stuck on the corner of a building.
It looked uncannily like the logo of a burger shop chain called "Wimpies" which used to exist.
The London traffic was bad, even in those far-off days, although the drivers themselves were pretty good.
This was not always the case in other British cities.
I remember coming off the Motorway to go into Southampton, & being confronted by a farmer happily towing a huge trailer full of hay behind a tractor right across a big roundabout at about 5mph, looking neither to left or right as he went on his way.
Talking about roundabouts---there was one on the other side of town which had a hill in the middle.
Another delight, which I'm sure has gone by now, was three lane roads, where the middle lane was for passing in either direction.
The idea is OK, but they placed them in the weirdest places, including on a strange, boomerang shaped bridge-----that was seriously scary!