Since there are no lights on main beam or flasher it does sound like both bulbs have gone,an unfortunate coincidence because the bulbs are a pain to change being accessed through the front wheel arches.
It could be fuse or a relay but I am not sure of the wiring circuitry but since you have to gain access to the bulbs to change them then you can check for voltage at the bulbs when you select high beam.
Vic.