A3 sportback 09 with a funny noise at low speed

i we've had our a3 for a few weeks now (first ever audi, love it)

Its an automatic A3 sportsback 09 reg 63k

Great car but im a little concerned about a strange noise.

At low speeds like 10 mph or less, you can hear a noise form the engine, a bit like a washing machine slow cycle. The slower you go, the slower the noise gets.

It doesnt seem to happen all the time, but maybe when its been driven for a few miles.

Its fairly noticable.

Anyone have any idea?

thanks

simon

bumped in case question got lost on page 2
Not driving it at the moment in case its a problem, checked oil seems fine.

I must be the first to have this.