My Venetian Blind is 179cm wide, but all the new ones are 180cm. I couldn't measure the 180cm new ones, in case they were truly 179cm, as they were all hidden by packaging.
The 3 brands found at the store (and online) are 'Zone Interiors', 'Windoware' & 'Pillar'. Whilst visiting the store I noticed there were leaflets to have the option to cut to width for both Windoware & Pillar but not for Zone Interiors. Windoware only have the 63mm slats but I'm after 50mm slats, so no go there. And the Pillar blinds only have cordless, and I don't want cordless. Is there an option to cut Zone Interior blinds?
I also have another window to re-fit which is 143cm wide but the closest in new ones is 150cm. So this one would definitely need cutting to size.