orange, yellow, blue and turquoise glaze - getting nowhere - help

I love this jug. It is incredibly pretty and absolutely gorgeous colours. But is unmarked.
So is it British do you think?
I thought it may be 30's and have searched Lancastrian, Shelley, Carltonware and Ruskin so far. Ruskin is the nearest. But wouldn't it be marked then? So what can it be? Is it maybe not British?
Any help on where to look next would be much appreciated. The glaze is part matt, part with a sheen (the orange has a sheen) the matt is sort of orange peelish in look.
many thanks
m

http://www.goldingyoung.com/catalogues/Ct140206/lot1124.jpg

could it be Royal Venton?
off to do some more searching but I found a vase that has remarkably similar glaze.
m

and possibly called Mutton Crackle. This link has masses of variations.

http://www.royalventonware.co.uk/vases.htm

stunning glaze! I have seen similar from factories in Stoke on Trent

it's gorgeous isn't it? I love that whole collection of the pots with all the different colours - they'd make a stunning display mmm, now where do I have room left...
m

Very Nice Glaze m, at first I thought Italian , but that's just a pure guess , it's the high handle and being unmarked , it does look similar to the link you showed ,but they are all marked , still nice piece though

Ed is right,the shape is Continental

well I did suspect that the shape didn't feel right for British (it sits really nicely with my WGP pots - so at least I have been learning something along the way. Will continue to search to see if I can match the shape somewhere then. Thanks all
m

not the first Italian to blend in when surrounded by Germans