Hmmm; since the sound is isolated just to the right-front wheel assembly and is intermittent, it quite possibly could be a small stone/pebble caught inbetween the brake pad/disc. Take your VX to a self-service car wash with a high pressure sprayer nozzel and spray the hell out of the front brake disc at point-blank range.

In addition, find a big empty parking lot at a K-Mart/Wal-Mart and "back-up" in reverse for a considerable distance (watch out for the street light poles). This may free-up the stubborn stone/pebble, as it continues to wedge itself while going forward.

If these couple of tricks don't work, then you'll have to remove the wheel and pinpoint the culprit.