I used CATS distance learning for my CPL a few years ago when I was doing my CPL, and they were still at Cranfield.
They were organisationally something of a shambles, and I regularly got extremely frustrated with them.
On the other hand, the notes were superb, the lecturers generally quite good for the classroom periods, they were very cheap, and like most people who went through CATS, I got a full set of first time passes.
So, on net, they're a good choice - just triple check all and any administrative arrangements.
G