incase anyone else can't find any - i've looked high and low for the older minkee colours and found some here:
https://www.btowstore.com/epages/BT.../?ObjectPath=/Shops/BT3270/Categories/Nappies
ETA: they have just emailed me to say they haven't got any in stock either
https://www.btowstore.com/epages/BT.../?ObjectPath=/Shops/BT3270/Categories/Nappies
ETA: they have just emailed me to say they haven't got any in stock either