If there is no mention of the waterpump, I would get in touch with the garage who carried out the cambelt and ask them to check the invoice they would have raised and ask them to go through the parts - Just tell them you want to know in the event the waterpump was not done. If it has been done then get the car checked out. If the waterpump has not been done - GET YOURSELF DOWN THE GARAGE ASAP AND HAVE THE BELT AND WATERPUMP DONE IMMEDIATELY. There is a chap on here (read the thread once) who had a similar noise. He lifted the bonnet and there was steam/smoke - it was winter so he thought nothing of it - he got down the road a bit and the belt snapped - the steam/smoke was the friction of the belt on the pump and the belt just gave way - expensive oversight.
In response to the interval chatter above - I think the general consensus is to get the belt done sooner than the 72,000 miles - 60k just to be sure.
I rang the garage at which the previous owner had, apparently, had all of the work done. The belt, tensioners and idlers had been done but not the waterpump - so i forked out to have the job done again, despite there being a minimum of 30k to go in the recommended life of it all - glad i did because the pump was beginning to show signs of wear and leaking. £300 - £500 to make sure you're safe or engine strip and rebuild, depending on damage - prevention is better than cure in these cases.