Here's some tips from someone whose married to somebody with vast experience in the industry.
The vast majority of shutters in the uk, look the same, central wand, with a hole at the side of the frame going into a louvre.
They are chinese shutters, they are not MDF as a lot of people claim, they are LDF the difference being medium density, and light density.
The cheapest place to buy them is at b&q, california shutter company do them via some sort of deal, get them damp, they swell, the plastic coating comes off, and they are prone to discolouration, they are however, cheap, and precisely the same as everyone else sells.
They are not made to measure, but made to fit, there is a vast difference there.
If anyone needs any advice, feel free to PM me.