Fuji - you're not reading the posts!!
Greaser has a JAA CPL/Frozen ATPL with a MEP rating and IR (NOT a multi-crew IR). Therefore his JAA IR privileges are valid both on SEP and MEP. To add an SEP class rating he just needs to fly a LST on a single (the term GFT died some years ago). Of course to use the IR it must be current (12 month validity). If, at the time he did it, he had asked for an IMC endorsement, he would have an IMC rating valid for 25 months. If he's now between 12 and 25 months since he did his JAA IR it may be possible to get the IMC endorsed but it'll cost money to the CAA.