Thanks for being in touch Linds.
When you say your small garage tightened the belt, and it now makes a noise - concerns. I’m also intrigued to work out how you actually know the belt is tighter than it was.
If (in caps) the belt is tighter than it should be, are you happy to entrust the fitting of a new belt and assembly to them?
Water pump? - if cambelt driven on your engine. Wondered what you propose to do about that.
Kind regards,
Gareth.