I bought a few parts from Ancaster in Welling, Kent a few years ago. They didn't know about it either until I gave them the website address. They didn't have the parts I wanted in stock, but ordered them and sold them to me at the price on the list +VAT.
The list was first published in 2013 or 2014, so there may not be much left. I don't know if it's an ongoing list or was just a one off.
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Thanks, maybe I'm way too late to get any parts then. I'll ring around a couple of dealers further afield from Peterborough and see if any of them know/have got parts in from the MOPAR Overstocks list before.