I have to admit John, when you had your cambelt done, I thought you'd had the waterpump replaced at the same time. I truly hope it lasts the test of time during your tenure of ownership. For me, it's just something I would have had done. I know too many people who've had snapped cambelts purely as a consequence of waterpump failure. Indeed, on my Saab 9-3, which is fitted with the Fiat 1.9 engine, all Saab, Croma, Vectra and Alfa owners sharing the same engine variant, have the waterpump and tensioner swapped out during cambelt change.
To me, it's just the sign of a poor or inexperienced mechanic who doesn't advise a waterpump replacement at cambelt change, but of course, if it fails and wrecks the engine 12 or 18 months down the line, there's potentially money in it for them should you take the car to them for repairs. If you don't take it back to them, they don't care anyway because if asked, all they'll say is, 'He didn't ask us to do the job!'.
I'm assuming in your case, that the mechanic took the time to unbolt the waterpump and physically check it, including the bearing in the pump?.....I possibly think not!
