Dear David and johnphillip,
I have googled Nils Landberg for images and found very similar vases in the same style.
Thank you for offering such astute advice. I think glass is starting go grow on me and I am now keeping a keen eye out for it on my travels!
It is a lovely thing to live with, just need to maybe invest in a few good ref books and grow the library.
Kind Regards,
Christopher