I do a very good range of real wood venetian blinds. They come in slat widths of 25mm, 35mm, and 50mm.
They are available in a good range of colours also.
All blinds have metal headrails not plastic, and they come with real wood pelmets.
The slats can be supported with cord or tapes in colours to compliment the colour you picked for the slat.
The slats are knot free with a very good smooth finish which helps to keep them cleaner.
Below are examples of some that I have fitted..... Click image for larger picture.