Have you tried entering "UK JAA IR(H)" into google, or "ME IR(H) JAA", or going to
www.caa.co.uk and looking at publications > licencing? Other publications include LASORS (on CAA web site), JAR FCL-2 (on
www.JAA.nl) or simply phoning PLD at the CAA.
That might sound flippent (and to some degree it is inetended to be!) but if you really hold an ATPL (I assume an old CAA one as you have no MPH types listed) and have previously held an IR (fixed wing I assume) the requirements will not be so clear cut.