I've got some noise problems with one of the front wheels on my truck - any ideas?

Driving in a straight line and at low speeds, it's a clicking noise. Go a little faster and it becomes a buzzing noise. Anything over 35 kph and it starts whirring - a constant wizzwizzwizzwizz noise.

Now, if I make a right turn and then drive in a straight line, the noise disappears, and if I make a left turn and then drive in a straight line, the noise reappears. Strange.

I'm guessing here, completely off the top of my head, but could it be the teeth on one of the front drive shafts rubbing/slightly catching somewhere?

Any help appreciated

Cheers
Rob