In Australia, ultralight aircraft and their pilots can either be registered with the Hang Gliding Federation of Australia (HGFA)[REF] or Recreational Aviation Australia (RA Aus) [REF].
The current UK regulations match the European ones[REF] although earlier UK legal microlight definitions described an aeroplane with a maximum weight authorised of (finally) 390 kg, with a wing loading at the maximum weight authorised not exceeding 25 kg per square metre.