So I contacted the lovely Trish from Ribbon Roll Control http://www.ribbonrollcontrol.com in the US. She is very efficient & helpful, & I was delighted to be told that I was her first overseas customer! My parcel arrived about a week later & here is my new storage system all set up - & very easy to do as Trish has a little video on how to put it all together.
I have stacked mine for the moment, but I will eventually mount them on the wall as Trish has thought of everything & has included holes for wall mounting. Finally I can easily see all my pretty ribbons & have them to hand whenever I need them :)
And it seems that I'll have plenty of spare rooms in the near future, so I'm in the process of re-thinking my craft space (hmmm......I may have to make a trip to Ikea) happy days :)