There's a big debate on some of the caravan forums such as this one on Caravan Talk
http://www.caravantalk.co.uk/community/topic/73394-side-lightsfront-towing-cover/. We have been participating in the conversation but we'd also like to shed some light on any doubts here(excuse the pun). Basically there appears to be a grey area over the need for towing lights, reflectors and therefore the legality of covering those lights. Some forum users have said that they have bought non Protec Towing Covers and they have not got provisions for lights etc.
Although we are not sure on what the law is regarding lights we always prefer to be one step ahead, just in case. All our Tailored Towing Covers come with sewn in clear light panels as we know the exact position for the lights on the new Bailey, Swift, Sterling, Buccanneer, Coachman and Eldiss shapes. The towing protector also has reflective strips/straps.
Not all caravans need a Tailored Towing Cover as they have a more generic shape and only need a Generic Towing Cover. As this cover is suitable for thousands of makes and models and the towing cover is a new product we don't have all the light positions for these vans, even though we do have the patterns for their body shapes for the full caravan covers.
So are the Generic Towing Covers road legal? Yes, 100% legal. All standard towing protectors come with a DIY Light Panel Kit which is very easy to use and gives you light panels with no sewing needed, you also get reflective straps/strips.
So the bottom line is that Protec Caravan Front Covers are perfectly legal for towing at night.