Hi Andrew
None of our perfect fit blinds, and none of our other blinds, are classed as a blackout solution.
We have blackout fabric, such as our Bella Perfect Fits but light will come through the sides of the blind where gaps are for the fabric to go up and down as light unfortunately comes through anywhere it can find!
A blackout fabric roller blind in a perfect fit system is a good solution, or a blackout cellular fabric in a perfect fit system such as Hive Blackout Perfect Fit.
I hope that helps?
Thanks
Sophie