Literally, how many times have we seen brilliant FI runs, especially on the GFS that have not materialised. Even when it has been consistent. I remain very skeptical that the outcome will be anywhere near what is projected. It's a computer trying to forecast the British weather days and weeks in advance. I think it's much wiser to follow professional meteorologists at the Met Office, although not always right, their verification stats are probably a lot better than any model, especially the GFs in the medium range time period.