Blinds Supermarket which are part of Hilary's blinds have 10% discount using the code attached and then a massive 15% cashback via quidco.
Delivery is free on orders over £50 ( £4.95) if under £50.
This is a good deal is you are purchasing made to measure blinds, in particular wooden blinds that you can not trim. Compared to blind company quotes I got this is almost half the price for just fitting them yourself.
You can also request lots of free samples.