There is no sensible budget if you're doing the JAA ME/IR
Probably not much help if you are doing the JAA IR/ME but from my experience of doing the FAA IR / ME, the IR took 5 weeks, and the multi another 5 days (10 hrs or so), then check ride. Shoot two approaches, one asymetric on the ME checkride and you get IR privileges in the ME as long as you do the IR first. Cost was: $7,000 ish for the lot.
Cheers
EA