Lets look at the facts...
The E46 bmw has been dumped. There is no other reason for it being parked on that angle. If that was your legit workshop, the angle of it parked like that would annoy you for starters.
Then there's the fact all the cars are either dumped on their discs or old wheels are propping them up. If you were a legit business you'd have stands.
Then there's the type of cars that are there. BMW/MErc and some 4x4's. Even a lambo ffs! All what thieves can strip and sell on easily. (apart from the lambo, obviously)
I'm not a gambling man, but i'll put a 5iver on it with you that those cars are part of something illegal. Care to make that bet?