Just passed my I.R with B-F-C I think you will find the likes of OATS are more expensive and you also get the benefit of operating out of a reasonably busy airport with proper commercial flights. my I.R cost all in with M.E. class rating £10500 all approach fees included, would reccomend to anybody who refuses to pay the 14 or 15 grand that OATS and the other main dealers want for an I.R. (Cheers Nasib and Lee).
P.S. The examiner is a nice chap too. good luck to Julian Sue and Dave!