FB,
The terms of unrestricted and restricted PPL were the old school:
Unrestricted was a full PPL license (VFR)
Restricted PPL (now termed GFPT) was flight confined to the training area, five mile radius from the centre of the airfield and a straight line in between.
A-S,
In Ozmate, the flight training requirement for an IFR rating was a minimum of 40 hours:
20 of which can be conducted in an approved simulator.
20 actual flight and in the case of a CMEIR - 10 could be flown a single engine aircraft with the remaining 10 hours in the ME type in which the rating was going to be gained.
Then the flight test ride (full test @ 3 hours).
The above does not include any initial ME type rating flight training nor any NGTVFR requirements. Prior to any flight training you had to have passed the Instrument Rating Exam (IREX). This exam is based on IFR procedures/regulations and met (heavy on clouds and ice - for obvious reasons). CASA has tinkered with this over the years and the last heard first time pass rate was running @ 12%.
The above was the requirement when I undertook the training. It may have changed over the recent years.
Good luck