I was thinking hard about getting an alternator this month to deduce if it was that causing the whining noise. Decided to wait another month and typically the battery light has now come on strong warning of impending 'you're fukced' status in rush hour traffic.
I've had to order a valver one from GSF. I dont run heavy electrics in my car so it should be fine...I hope. Just hope the car holds out until I can get home!