*mod hat off*
I have no idea! It may be simply to protect the names.
ETA - there is a thing called group relief (which sounds really dirty) which is essentially about moving losses from one group company to another to reduce the other's tax bill. It's a bit more complicated than that, but it's enough. We can't see what, if any tax losses there are in the group. This is usually useful where you buy a company with tax losses.
Not too sure how it saves money - there are extra legal fees and administrative costs for each company.
Seems like a really convoluted setup for company with a sole purpose to its existence.