my car passed its mot with really dark tinted lights.

I used a spray tint, I did post a thread somewhere.

The great thing with this stuff is that you can remove it with nail varnish IF it doesn't pass the MOT or you want a change.

Personally I think the dark indicators are much better than the orange ones and easier than dismantaling the front end to fit R45 headlights.

My undersatanding, but I could be wrong is that reflectors must be left clear and unimpaired.

Usefull to know it can be removed with nail varnish, does it leave any smeares when removed?

well they are meant to be illegal its always been a grey area i suppose it depends if you get an mot tester that really hates modified cars like my old mates dad, he resprays cars and does a good job but refuses to work on any modded car lol.