Helimutt,
The IR consists of a departure, en-route and an arrival, to include a hold.
Basic instrument flying (which you need to have done before you embark on your IR training) was always part of the ATPL(H) syllabus when I was doing ab-initio instructing on the Bristow Training School and we used to give 10 hours of instruction on that using the Bell 47, then later the R22.
I don't know what courses they will be offering on the AS355, but you should be able to find out from them later in the year. They have aground instrument procedure at the instrument school. I suggest you contact them at Norwich if you want to find out more, +44-1603-402356