I've tried a search both here and on the net but cannot find the answer and I don't have a copy of Construction and Use regs so I'd be grateful for some advice.

The rear lights are mounted on the mudguards and the rear of the car projects rearwards of the mudguards so that at some point if you view the car from the nearside the offside lamp disappears. I'd like to know the permissable angle please.

I'm hoping my rough sketch will clarify what I'm asking.

Thank you for any help.

There you go -

IVA manual

I am indebted to you, thank you so much for your help and such a quick response to my question.