Yes, pretty much the same - you do the course and get an AFI rating, then after a certain amount of time as an AFI under supervision of an FI, you can apply to upgrade.
That said, I think that there are routes whereby a full light aircraft FI can rate to instruct on microlights without having to go back to AFI again. BMAA should give chapter and verse if asked (01869-338888, ask for Roy Hart), or alternatively Geoff Weighell who runs the school at Enstone is a microlight instructor-examiner, so should know everything there is to know about the rules and regs and might if asked nicely enough be able to help out with FI cover.
P
N.B. Genghis, you missed the type you fly:-
Thruster TST/T300
Thruster T600 Sprint (the newest version)
