Geoff,
Enjoyed your story. It's how life was back then and I hate to think about the stuff I put down drains. I had a battery go over in the back of my Ford Anglia van. Rags, hose pie, soap etc. Three weeks later the floor fell out!
Tried getting scrap lead pipe from the local plumbers and failed miserably. They don't get it very often these days and when they do they are straight down the metal merchants with it (it's not of much use to them and it's money sat there on the floor). I think 'plumber' is now a misnomer. These days it should be 'copperer' or 'plasticer'!
The point of all this is don't wait until "the time comes". Get your order in now with your local man. If you don't then "Go to Start", and read my first post!
Len