Iv.e never heard of a driver has been done for it and plenty do run like that, or they go and ask VOSA where they stand you will never get a straight answer to the question, I have heard of 1 getting done but that was a heavily loaded box, IIRC he actually crashed it.
Just because a sticker says do it like this or like that doesn’t make it law, the majority of them are put on there by the company who owns and runs that trailer and they want it done like that, which is over and above what the manufacurer puts on from new, that’s called company policy.
I have asked VOSA this question before and their answer is, as long as the axle weights are legal, they have no interest.
If anyone is really bothered about it, they should ask VOSA/DVSA next time they see them.
Iv’e done it a couple of times myself, sometimes it makes it easier to get out of tight areas but a bit bumpy as said, so i just open it up to the loaded 30’ box position instead.