I could not talk to Turbine Services Ltd until yesterday (Monday) morning. They have been very efficient and attended today. I was out and have not had a full report but it looks as if both the control box and the inverter have been replaced. All is working well at present, in light wind, generating about 500-1000 watts.
After previous delays, waiting for parts, I have been very impressed by how quickly this latest problem was solved. I understand that Proven are planning for their main installers to hold a stock of spare parts. This can only be a good idea and improve the service.
Roger - while subject to the usual winter gales, living on the West Coast of Cumbria, there has been nothing exceptional lately, no more than force 7, perhaps gusting 8.