Hi Craig,
Thanks again for the info. Remarkably earlier today following a conversation on glass, of course, I was lent a copy of an old US magazine entitled Czechoslovakian Collectors Guild International Volume 1 issue 1 which is dated Spring 1995. The front page cover reads The Art of Michael Polowny the Master. I must have borrowed this before or seen it whilst visiting my fellow glass collecting friend as I could remember some of the contents. The mag actually concentrates on the aforementioned 3 handled vases which were attributed to MP. How times move on, hey!.
However there is an excellent section on the colours used both solid and contrasting together with their rarity values. Unremarkably, my pieces are referred to as being "light blue" the only other blue being "Periwinkle" which is quite dark. There are light blue pieces shown with both black and also white rims/pads. Good reading. I do love this hobby, it keeps me semi sane!
Thanks again,
Bryn