Tom and Carol filmed this yesterday. Listening to it makes you realise just how annoying the sound would be to experience day in day out. The high-pitched screeching half way through is apparently the turbine moving round to catch the wind. As Tom says “could do with some WD40”.
Save Straiton for Scotland 
One of the nicest things about Straiton is the silence. It would be a terrible crime to spoil this.