The problem is that under JAR, only the real high-end (ie. most expensive simulators) can be used for IR training. As an interim measure, there are some older cheaper sims around (c.£100 ph), but these are under grandfather rights and will have to be scrapped soon, plus you can only do the first 20 hours of the IR course in them (and then you have to fly a real SE or ME aircraft for the rest of the course, you can't switch into the more expensive sim).
The top end simulators actually cost as much to run as a 172 at commercial rates, you can expect to pay around £130-£160ph for them.
Multi-engine IR training comes in at around £280 - £350 ph depending on ac type and school.
Expect to pay £8,000 - £10,000 for the IR.
And then there's the CAA test fee of £564 and 2 hours aircraft hire for the test. Not to mention retests if you don't pass. And When you pass, the CAA charges you £128 to add the IR to your licence (which takes the trainee 30 minutes to print!).
Then you have to renew it annually - the best way to do this is to renew your MEP rating and IR-SPA-ME at the same time this will cost £1,000 if you're current, more like £2,000 if you have not flown ME-IFR much and need a couple of pre-test lessons.
You can opt to renew the IR-SPA-ME on a sim which is much cheaper. Unfortunately you cannot renew your MEP rating on the sim, so although your IR will technically be valid for ME, you won't actually be able to legally fly a multi-engine aircraft because you have no MEP rating!!!
Key to JAR acronyms
IR-SPA-ME Instrument Rating - Single Pilot Aeroplanes - Multi Engine
MEP Multi Engine Piston Land class rating
Welcome to the expensive world of JAR....
foggy.