Yes Haroula - these are the ones I buy, with all the dirt and they are the ones that have a greenish tinge when I peel them. {Or maybe it is just the 1970's fluoro lights in my kitchen making them look greenish.}

Thanks for all the info Rayray - I have now binned the rest of the bag of potatoes. Am TTC ATM so not taking any risks.

I think in future I will buy unwashed ones and only in small quantities which can be consumed quickly. I am so sick of greenish tinged potatoes - or maybe I just shop at a bad greengrocer.