I did my degree project on Wind Turbine blades - hence the interest and why I was looking on the Crown Estates web site in the first place - but (way back) then they all talked about siting them 'far away from land' to reduce the 'environmental' impact (on us humans I assume).
That looks like what they are trying to do in the North West - at least they're a few klicks offshore. I wonder if the planning for building them takes into account previous usage and stuff like that?
It does seem a bit odd that they want to do it in Portland Harbour, and on top of known, good, dive sites. There is a lot of sea-bed between the low-water and the 12 km line - I'm sure they could find a bit no-one was THAT bothered about if they tried.