I've recently had noises from mine too at start up. Already had it booked in to CW's for a 54K (6K) service, so told them about the noises and concern that it might be related to the alternator belt - especially since it got worse having fitted extra lights. They managed to get around to that too and fitted a new belt - luckily for me. Having looked at the old one, i only had a few miles left before i'd have been chargeless. Old belt was completely knackered. Less than a quarter of the original width. Winter's approaching so make sure you can ride through it ok. Also got a new battery too, as mine's a bit ropey.
Johnieeeeeeeeeeeeeeeeeeeeeee