Thanks for the replies so far.
Max - I agree they are modern pieces, but they're not current modern or available in any of the shops I browse regularly. Pip - the blue bowl is a little like the Royal Brierley irridescent pieces, but the different shades of irridescence are quite clearly delineated, whereas in the Royal Brierley the colours blend and merge together. Anne - your photograph of the blue one shows the bubbles more clearly than my picture. Does yours have that wonderful ring as well?
I look forward to more thoughts on these bowls.