Really enjoyed that episode - great idea for a feature.
My Dad tended to hold on to his cars for a bit so mine's a short list:
Renault 30 TX in blue - I loved that car immensely. I actually bawled my eyes out when he traded it for his 1st BX. I think it took my mum a few months to forgive him as well as she loved it so much.
Citroen BX 16 TS (I think) - A reg, in red, so when they first came out. Despite initial loathing because it replaced the 30, I grew to "appreciate" this one. That suspension was CAF to 5/6yo me.
Citroen BX 19GT Digit - C65 CNF, in silver. 1 of only 500 of the limited Digit models to reach the UK I believe, this was a gem. Had an on board computer, the coolest dash of any car ever, and a Pioneer pull out stereo:
He held on to that a looooooong time - 9 years and the best part of 200k miles I think (odd how owning a car for 9 years seemed like aeons back then!). It was fairly tatty when he part-exed it and I suspect it was scrapped as it looked a bit tired. Ultra rare now - not even sure if there are any on UK roads. Chopped in for:
Renault 25 TXE Executive - K970MCR in blue. Another corker and the last I'd consider in any way cool or memorable. He had this from '94 to '02 IIRC and that still seemed a long time. Had it up to 275,000miles by the time he traded it in. Not as reliable as the Citroens, from memory, which would mirror my experiences of PSA vs Renault products. But it was a great place to be, and had what seemed like a good bit of grunt. Always stood out like a sore thumb at parents envenings at school, with most of the other parents driving BMW/Merc/Audi/VWs or Volvos/Saabs.