Got an update on this change.com campaign today. Apparently the royal mail's decided it's ok to post water based paints again (no more 4 pots limit, but an overall content limit instead)

https://www.change.org/p/moya-greene-lift-the-restrictions-on-shipping-water-based-paints/u/9295196?tk=AGkqibLsl7EMA_Iu7aaoqc9MR-6SjB-EUl1ARA5_yvY&utm_source=petition_update&utm_medium=email