PVC pipe offcuts (Old Walcot SN3)

I'm looking for PVC pipes of the kind usually used for waste water - fairly rigid, and either 22mm or 32mm diameter (not the much wider pipes used for big downpipes and drains). Any lengths over 60cm long (a couple of feet in old money) would be good. Condition not relevant as it's for an art project rather than actual plumbing. Can collect within range of Central Swindon, or Shrivenham.