Kashmir White?

Thanks Teadrinker, I'll look it up.

Have you found one yet? I know I'm late at coming across this, but I would like to suggest the white version of good old G. sanguineum. Assuming that you might mean spreading or ground cover, by scrambling?

Thanks for the interest John - I opted for Geranium pratense plenum album - it has the height I am looking for and therefore hopefully do the job I want it too do.
By scrambling, I mean scrambling up through other plants, just as my G. psilostemon and an unknown blue one I have does. You can just make out the blue one at the back of the image above.
I have G sanguineum and G sanguineum Inverness - obviously not white flowering but I'm not sure they'd have the height I need.