Thanks Paul and Fred for your interest. The plot thickens.
Sowerby mark is actually on both pieces. The jug seems to be manufactured in four sections as they can be clearly felt but cannot see any lines in the bowl.
I didn't realise that the markings on the CD lozenge may be generic as hadn't read where it was discussed on the GMB. As to the markings that are visable, the class III is on both but on the bowl only the outline of the diamond is visable. The glass is a little rough on the inside of these bulbous sections around the bottom of bowl/dish. On the jug, the diamond is on one of these bulbous sections that is pushed out to the outside adjoining the base. When one looks straight down into the jug the visable R looks to be in bottom of the diamond. When you tilt it a little to the side there seems to be more of the diamond on the side of the piece. I very awkward place . I now think that the R could be in middle of diamond for Rd. Sorry for my confusion, it's difficult to view. I cannot decipher the L or K now, must have seen this on the CD.
The jug is only 6 1/2 cm high, it's bowl is 6 1/2 cm wide and handle to spout at widest point 9 1/2 cm.
The bowl is 13 cm wide and 6 cm high.
I have seen Rd314279 in the colour of Fred's photo but mine is actually the same as this sugar and jug. Can't believe that I hadn't noticed this before.
and