That little factory is really shady, it has been for as long as I can remember. Inside that door at the front are the main doors, double reinforced steel jobbies yet they're never used. They don't advertise what they do, there's no signage or contact details anywhere, nor as there ever been, well apart from the "Danger of Death" signs.
To top the lot, really shady dark coloured Luton Vans and Transits (or the equivalent) are dropping boxes of 'stuff' off to the small door just around the corner in the wee small hours. I've only ever managed to get a quick glance inside once, and it's full of huge lathes and other large industrial machines that are strangely silent, even when in use.
On a lighter note, those trees you can see are in fact the far side of a river which runs just behind those two concrete posts, so this area is great for cats if you don't mind them leaving countless half-dead rodents and birds in the garden.