From Vincent: The squared bottle is probably slab built, white earthenware. Painted and sgraffito decoration in oxides with a reduction firing to bring out the iron particles in the slip. Has a 60's, Paolozzi feel about it.
Vincent - UPDATE. I beleive that this pot may be Spanish as I have recently acquired a vase with the same mark created for the Andalusian /Selsdon Park Golf Cup 2009. Info still wanted,