The only practical option in GA flying for BRNAV is a GPS. I have yet to meet another regualt airways flyer who is flyin airways relying on the old steam methods.
It is fine to come up with smart arse comments about only needing a compass for IFR flight but that is not what is being discussed here. The UK is an anomoly in that you can fly IFR with only a basic PPL and that you can fly IFR in Class G.
The reality of IFR flight is that it takes place in controlled airspace starting or ending in a procedure. For this appropriate equipment is needed which included ADF and DME.