I'm not "au fait" on legal matters but I am certain that you have rights that supersede the warranty period - an item must be "fit for purpose" and that includes a longer time-span than one year for an oven!!!
I've copied this from What Consumer to save you trawling thru the articles, but you would have to take it from there - although quoting the words "Statutory Rights" at QVC CS might do the trick ???
items which should last several years can still break down after this six month period. If the retailer or manufacturer’s warranty has run out, the shop is often quick to say there is nothing they can do before attempting to sell you an extended warranty. This is misleading. If you buy something which should last 7 years but breaks down after a year and a day, you can still claim it was of poor quality in reference to the durability aspect. In this respect it will help to know how long items such as washing machines or printers should last. You can get this information relevant trade association.
HTH,
clemenzina