Hi Derek
Unfortunately yours is not the only hob with this problem. I have the same on my Abbey Vogue which, although now over 4 years old, did, in fact, show the fault well over a year ago. To be honest I didn't think the dealer or Stoves would accept any liability so didn't go down that route but would be interested to know how you get on.
Another fault that mine is showing is the paint along the front edge just above the control knobs. Here the paint has become very crinkled, I assume because of the heat but a recent thought occurred to me. Was / is this paintwork covered in a plastic protection film that should have been removed at PDI and is it the film hat has crinkled? I have been tempted to try a sharp knife under a small bit of it but chickened out in case it makes the problem worse. There appears to be no instructions anywhere about removing the film prior to use but I know it is used extensively in the 'white goods' industries during manufacture.
Any comments would be welcome.
JohnM