I stopped buying from Duo boots because their sizes are utterly random and ended up spending a lot of money on delivery and returns. I also felt that they were grossly overpriced and only worth buying in the sale. I don't have an issue with calf circumference so don't care for the fact that they offer that, but I am short, only 5.2", and struggle to find boots with a 6cm block heel that don't come up too far up my leg. Ted & Muffy (such ridiculous name) seem to have a few suitable options at the moment but I can't work out if they still charge per each pair you buy and returns.
Cheers all