I know there are people out there that go IMC in a single.
Yes Sweden and even the UK have a jetranger for IR training. The cost is quite high and for the difference you'd pay, you might as well spend that little bit more to do it in a twin. An IR(H) on a single in the UK is absolutely no use whatsoever unless you are only getting it as a stepping stone to moving onto multi's.
Granted, IMC training does have it's uses for some but for the PPL holder, why even teach it? Why not impress upon them even more the stupidity of going IMC without proper training and equipment?
Why would you need to make a decision about the IR(H)? You're either going into a job where you will need it or you're not. Seems pretty clear cut to me.
The only real question is 'is the company going to pay for your IR?' If so, do it on a multi because it won't cost you a penny!!