Once you're out there in the big world, a busy arrival at some big airport in IMC in a fast aircraft is really not the time to start mucking about with VORs and ADFs.
Ummm.
This is getting off topic somewhat but should not be allowed to pass without some comment. Unless you are arriving at the one and only UK airfield with an approved GPS instrument approach (Shoreham) then unless you are doing an SRA or ILS approach then VOR or ADF are your only other legal (and safe) options. Last time I went into Southampton in IMC I used the VOR and ignored the GPS in the cockpit.