Funny noise

[Simon Wallwork]

I just bought an S8.

Put it into Audi Glasgow as it was due a service. Got them to do the gearbox oil filter and fluid as car was at nearly 90,000.

Picked up car on friday night to find it makes a noise now that it did not make before.

Only seems to happen on initial move off. Sounds like a 'rubbing' or 'whirring' noise. Comes on at about 15 mph and goes away at about 30mph and does not come back until next move off from rest.

Like I say- didn't do it before the service during which they changed 5 litres of ATF and the filter screen and O ring. At least that is what it says on the invoice.

It's not a loud noise. With the radio on you could miss it.

On the other hand it's one of these noises that could be serious.

Any ideas??