I got a water pump ok (none adjustable) and ordered a belt from euro parts at around £7

Euro Parts has been good for buying parts for my Peugeot 309 GLD, Their own front discs, made in Scotland were just £10 each. Lower rear engine mounting £1.36

Will be replacing the cam belt on the 309 today as all the bits are in now including the alternator belt and vacuum pump belt. Not much room down the side of the engine, as it is transverse, so won't be easy. But she sailed through another MOT last week with no pre-mot check, not bad for a 1989 ;-)