Assuming that we are talking about the 'approach ban' in the UK, how is the Final Approach Fix relevant? The ANO 2005 states:
An aircraft to which article 38 applies, when making a descent to an aerodrome, shall not descend from a height of 1000 feet or more above the aerodrome to a height less than 1000 feet above the aerodrome if the relevant runway visual range at the aerodrome is at the time less than the specified minimum for landing
No mention of FAF as far as I can see.