I don't think so - and they certainly make themselves very difficult to get hold of Personally I'd pay more and hire NHEC, or less and hire Barrow Farm RDA depending on your needs.
According to the student details link from the equine page you still can but not heard of anyone using it since new yard manager. http://www.writtle.ac.uk/pdfs/Equine Livery Information.pdf
There's also finchingfield if you are the other side of Chelmsford?
Thanks. I do occasionally go Finchingfield, just wanted to hire an indoor school somewhere local to have a good schooling session or lesson with my instructor, as where I am the school is water logged and can't do much in it at all. Haven't been Barrow farm before whats the school like? Wanted to go Writtle as its only 5 mins down the road in the lorry and wanted to show my boy the mirrors. Is there any over places you know of?
Barrow farm is decent enough, reasonable size and the surface is fine for flat work though not great for jumping. It's cheap for what it is though. I think there are mirrors there too but not so many...
There's also an indoor which is hired out in Radley Green. It looks nice and is reasonably priced, though I've never used it (despite it being very local for me!).