It cannot be coincidence that the only two UK Airlines with CAA approved FRMS both have commuting protocols as part of the FRMS and one has it written in their FTL scheme.
Anyone residing over 90 minutes away (road) has to submit their protocol to the Company with evidence of local arrangements and how they get to work.
This is primarily as EU law now dictates crew members responsibilities as much as Operators responsibilities.
What happens if crew members float the regs - I have heard 2 cases of instant dismissal (not at the above airlines) but at another BIG AOC.
These rules are only to manage the 5% as we all know