Roz with all due respect i think you need to pause and think and then come back when you know what you are talking about.
It is NOT what you describe, it doesnt let the light in on the side as it is fitted on the window frame.
You may or may not find them ugly, it is EXACTLY the same as a velux blind (which you probably find ugly) without a stainless steel frame but a white one.
I am also having lovely roman blinds in lovely fabrics fitted by Craig if you must know.
I (and others who have posted in the past) need 100% black out for sleeping because this is what they like and these blinds do a perfect job for shash windows. So i am only sharing something i have found fir others to use if they need it. I have been using smthg like that for years but in my own DIY version
(It would be nice if trades dont jump on a thread at the first opportunity to advertised directly or in a subtle way like you just did.)