Hi mike,
i think i while i mentioned this as it had happened to me with my clio,it had limo black on the rear side windows & dark smoke on the front door windows,
as you say the law states that 75% of the light MUST pass through BUT at the mo the polis & government cant make there mind up so most police forces are going for a no tolerance initiative, as you also say i guess you got a prohibition order saying the vehicle cannot be moved unless al 4 wheels eare clear of the ground ie on a trailer or transported,i got one & its now framed on my bedroom wall along with the un prohibition order 8)
at the time i knew my tints were illegal so decided to go along & basically not cause any hassle so for doing this i got of with a £30 fine instead of the £60 & 3 points they can give,
oh i almost forgot to say,my tints were 19.3% on the front doors & if they had been any darker IE 15% (i presume the talked you through the limits in the comfort of the jammer) i could have been done for driving without due care & attention & also for driving an unroadworthy vehicle
Not wanting to preach but did they say anything about the extra wide wheels & the fact they stick out abit??