yes we had blinds made by Hilary's (the national chain) they made us beautiful roman blinds and we could choose to have them black out. i know there are lots of sellers on ebay who make roman blinds to order and again you can ask for this extra to be made into the price. I found that the bog standard ones for sale in Argos, Dunelm, Ikea etc are quite 'flimsy' with light weight fabric, you could always get these and if you know someone handy they could alway 'sew in' black out panels?