My E55 had illegally dark tints on the front side windows when I bought it. Never did get an MOT fail or a stop until it was removed. View attachment 165832
Mine looked great with the front side tints....they were not black...bit too dark to risk. Where I live they just screamed "stop me officer"!
Strangely tints aren't part of the test yet...illegal levels or not.
The metallic films are the ones that effect radio signals, most window tint professionals don't use them anymore for this reason. They use dyed films instead. The metalic tinted films are mainly used in commercial buildings, they're also slightly more expensive from dyed films but less than chameleon films.