I would only get the water pump replaced if showing signs of wear or leakage.
1.2 16v? yes, belts i cant remember from the top of my head but cant see them being any more than £40 for the kit non genuine, and a genuine pump last time i checked was around £60 be cheaper going non genuine however ive never used a non genuine pump so dunno if they are worth it or not., labour 2hr max @ what £40ph so id be questioning anything over £200 for belt and pump alone, add a service onto that and your looking at £300 or there abouts absolute max
i think i need to get mine changed. its on 57,000 1.2 2001 and I think its on the orignal one!!!