This is the relevant bit, you need a producer statement for high wind areas.
The thing is that the council has said that the existing producer statement and engineers calculations are for a low wind zone. The same exact sheds are being sold today, and we supplied the council with a producer statement that is less than 12 months old, which says it has only been designed for a low wind area. Yet we were told by the manufacturer that it that it would be fine for a high wind area.
The manufacturer "saying its fine" won't stand with the council. I would challenge the manufacturer to provide you a high wind area PS, or argue that they have provided you something which is not suitable.