As I understood things - but I am only looking on from a distance - the audience consisted mostly of people either operating a G-reg "permit" plane based outside the UK, or intending/planning/hoping to do so.
But if I opened the thread, it was in the hope of better understanding what and why. @Piper.Classique, on what registry is your Annex 2 plane?
@patowalker: there are indeed many French registered ultralights based in BE - estimates seem to be 30-50% of the total fleet - but very few D-Mxxx ; in fact I've only once come across one, and that was kept on an extremely low profile - for reasons I will of course respect. In fact the whole concept of the Belgian "overflight tax", which makes this country undeservedly impopular with foreign sub-ICAO operators, seems to be the desire to at least get SOME money from the many F-registered ultralights. I have yet to hear of any genuine foreigner to suffer from this ruling.