SPS
There's one other R22 instrument trainer I know of which is on Burman Aviation's fleet G-BOAM. It's a bit of an old bucket, but it has all the toys you could ever want on board. I don't think it gets used as such, though. (Instrument trainer, not bucket!)
I'd second all the comments made about avoiding being in IMC in a robbo. 10 hours instrument appreciation does give you a feeling that you could handle an inavertent entry into IMC, but the reality is somewhat different. Having an instructor alongside, and a hood that you could remove at a moments notice is no match for the moments panic realisation that you really really can't see where you're going, and you're on your own.
I've been 'under the hood' quite a bit, and it certainly trains you to concentrate on the instruments, conduct your scan, and fly your way out of trouble. But only for a short space of time, and only if you have your wits about you and are kind of expecting it. The first time you fly into REAL cloud, the sudden-ness of being enveloped by 'fluff' is breathtaking and will remove your concentration, replacing it with panic.
I remember the first time I took a twin Squirrel up through the cloud layer for about a minute before I broke through the top. After all the training, I still didn't breathe the whole time. And I had a 10k+ hours IR pilot sitting next to me!
I remember having about 200 hours up, and 'experimenting' by flying straight through very small fluffy clouds in an R44. The kind of couds small enough that you'd be through and out the other side in about two seconds. That was OK. Concentrate on the instruments, set up for straight & level and focus on maintaining the attitude all the way through. Nevertheless, the cloud rushes at you at the last second and makes you jump the first few times. Then, I hit a cloud that was thicker than I thought. It took me all of about five seconds to go through. No real big risk, but enough to make me certain that flying into the real thing one day was going to be a BAD experience, to be avoided at all costs!
Treat with caution! If you MUST fly a robbo in cloud, just do it on a PC!
Holly