So many old-school yards are now gone, and regrettably rightly so given the way they used to just drain everything straight into the ground. Rainham marshes used to be the place to go for me- it was a whole day out as there were around 20-25 yards all next to each other.
It's all gone now and been returned to nature, and I have to say it's probably a good thing as it was a horrible polluting mess, it's a symptom of how much contempt the environment was held in in the Sixties and Seventies that it was allowed to become a sort of scrapyard city. The area is pretty much unique in the Thames estuary and a bit other worldly now like it should always have been, but In the eighties when a lot of it was used as a firing range it was scrapyard heaven- we'd all pile into a car on a Saturday morning, go to Rainham, stop first at the yards near the Tilda Rice dock, then have a burger and tea from the wagon there, and on to the main body of yards a mile or so further on over the marshes. We'd be there all day- some of the yards were specialists breaking only commercials or Japs, but most were just general breakers. Then on the way back there was Maybells yard on the A13 where you'd have to do a crash stop and a quick turn to get in before being rammed by the motorway speed traffic behind. That's gone now as well.
Another Essex scrapyard heaven was Temple Farm out past Chelmsford on the A12, it was basically a gypsy site with scrapyards attached and a no go area for officialdom. There was also a rehersal studio there which we used to use in my rock'n'roll days, run by a chap called Laurie who'd been a bit of a local musical legend in his day. He was right at the end of the scrapyards and as far as I know never had any planning permission or paid any tax or anything remotely legal like that, he would only take cash and was always spraying cars or cutting them up, and he'd occasionally pop into the studio for a beer and a jam, and then back out to whatever shady car stuff he was doing.
I use fleabay now, the postman brings the stuff, a lot cleaner

1968 Triumph Vitesse Mk1 2 litre convertible, Junior Miss rusty has a 1989 998cc Mk2 Metro, Mrs Rusty has a modern common rail diesel thing.