Thanks for all the feedback guys.
So, can I summarise by saying that yes, one can aquire an IR with a CPL(H) which is over 36 months old as long as one doesn't intend to have or need an ATPL.
To achieve this, a flight training course + 6 exams are necessary (taking out Human Performance)?
Once completed, the pilot will be able to fly a twin engine (obviously having gained the relevant ME rating), silngle pilot helicopter with IR privileges for charter/commercial flights within the EU?
Stik ('s mate!)