There has been a thread here about this.
I thought it better to create a seperate thread to debate this as there is obviously a difference of opinion.
It is my position that fire cables DO need to be seperate or segregated from all other circuits.
From BS5839
The belief that 7671 overides in this area appears to be incorrect. As it IMO only applies to the incoming power supply cable not the elv cables
Another Quote
and
Seems pretty clear that if it is not segregated its a variation and must be noted as such