Adrian wrote:
gurgled happily, sounding much like they were saying:

The other frequent problem with these* is tinted windows that are too
dark to see through properly, so you can't make eye contact and you
can't see through to the other end/side.

There ought to be a law against front windows being darker than, ooh,
about 70% VLT...

If TPTB were really serious about it, they could enforce it by giving
plod cool little hand-held light transmission doofers, so that if they
suspect somebody's got windows too dark they can serve a vehicle
prohibition notice and get it off the road until the tint's been removed.

They could even put legislation in place that the installer of the tint
or seller of the vehicle could be prosecuted.

Nah, it'll never happen.

Oh, wait, what was that? Damn near five years ago?
http://www.window-tinting.net/thelaw.html

At least 23 years ago and possibly well before that :-

"Tinted Windows
[......]
For motor vehicles first registered before 1 April 1985 the windscreen
and front side windows must allow at least 70% of light to be
transmitted through them.
[.......]"
[VOSA press release 21 Sep 2004 - VOSA now have powers to stop motorists]