After Amazon have let me down anyone recommend a retailer who can do the Fenix 3 Sapphire version with HRM for less than £400?
Outdoor GB - cheaper than the manufacturer directly!
Go Outdoors do a 10% price beat promise. Worth a try against the Winstaley price.
Quick update. Go Outdoors would match the price plus 10% off the Winstanely Bikes price but they only stock the standard Fenix 3 in grey and without the HRM belt they would do this for £243. They don't keep these in store but could have then delivered to you or store next day.
Amazon promised to sort out my order and get it to me next day and since it was the Sapphire version I went with them in the end and it arrived today.
Thank you all for your help and hopefully anyone looking for the standard version can take advantage of the Go Outdoors price match.