The point I made earlier is totally academic, however if the CAA turned around and said "a foreign IR holder can exercise the same privileges as an IMC holder" then this would allow flight in Class D and below, and hence if the French agreed to allow the same privileges as the CAA allow in a G registered A/C then you could enter airways in France and file an IFR flight plan.....a cheaper alternative to the JAA IR for the PPL.....
Cheers
EA