Hi all,
Not a conclusive assessment I'm afraid - more of a discussion about the item.
No, I don't think that it's pre-war May Green, and the colours changed post-war. The way that the colour's laid in is closer to items that were in the Elwell find, for which more research is required to attain accurate dating.
The foot and general form is close to an 'egg' shaped vase that is often referred to as Nazeing, although those have broken pontils. It is difficult to see the way the base is finished on your photo Ronnie, but it appears to have a ground 'satin' finish, which I associate with post-war items of Nazeing.
Nigel