Right then an ex full time instructor, single crew IR, goes to fly a shiny jet, only renews his multi pilot IR, because the co. pays. Continues to instruct part-time, say 30+ hours a year, ATPL expires and co. pays for a JAA ATPL. = no more teaching IMC either in VMC or IMC. Unless he gets his hand in his pocket and renews his IMC or IR.
A pilot flying say a Bandit with a single crew IR can jump into a C172 for the first time for 'ages' and take his wife and kids and whoever into the airways in any wx.
Now that makes sense, I don't think.