Can't speak of any of the other schools at Cranfield but having gone all the way from PPL to MEIR with Billins Air Services, I'd go there every time.
I know they don't do the full range of training now, but a few years ago they did. I went round OAA, Cabair, Bournemouth and many others. The thing that sold me on Billins is that it is small, friendly (help yourself to tea & biscuits) but if you want to learn properly you will be made to do so. The instruction is great, and if you work hard, the flying / training becomes easier.
I think I owe much to Billins Air Services to the fact I now fly 757's.
If I was starting again, I'd go there again.
DW.
Edited to add: oh yeah, going since the 90's so business wise very solid. However if you wish to pay up front (caveat emptor) there used to be good discounts available for small block times - not the whole course.