Action is a bit like Woolworths of old. Selling everything from craft supplies Tupperware and cleaning products. It's useful but not exciting imo.
Noz on the otherhand sells bankrupt stock, end of lines, over production etc. You never know what you are going to find. (Though they often have good socks) We have had great clothes from there over the years, they have random dvds, often good stationary. But thebest bit is the food and drink section. The wine can be excellent, and the foreign stuff is marked way down, especially if the label is not in french (think chilian merlot with a Chinese label) Most wine we get from Noz is under 2€ a bottle and it is normally very good. They often have british food stuffs with tesco or asda labels.
@heylittlehenwhenwhenwhen you have to give it a try. Not all Noz are great, I've been to 3 or 4, but our local one is my favourite shop.