I have at last managed to identify this cute milk jug and sugar bowl which has a reg no. 791399 which dates from 1934 thanks to Marcus's CD Rom of catalogues. They are in the Libochovice catalogue before 1958 page 38 pattern 1498 and 1499. Feeling pleased with myself
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-18394