Definitely not a large company, i went to the store regularly when i lived in London, the place is small, they usually have two people there.
Back when i ordered my LL in 2013 they had two people working the store, and two guys making the jackets in a separate workshop and Derek, for a total of 5 working there. Back then my custom Dominator cost 475GBP!
I'm sure the company has expanded since then, but it is definitely not a large business.
It is much smaller than Aero for example and that's already considered a small familly business.
Personally i never had a great experience with Derek the boss, i found him a bit dismissive, i got on much better with his right hand man, whom i unfortunately can't remember the name. (bald guy who was always at the store)
It´s now "Jack" at the store (youngish guy, guitar player; I believe he does some modelling for LL´s Insta), and I found him extremely forthcoming on all questions I had both in person and via the phone (E-Mail has always been Rip and Aki, though).