Thanks for all the replies, it makes sense to me that the cooker should be tested for safety, I don't want it to burn the house down or electrocute the tenants. As many of you have said I can't see how worn temperature numbers can be dangerous. We have been sent a picture, but it is too small...
It's an integrated oven. The house was having an electrical safety inspection, the electrician offered to do a free pat test of any appliances and checked the cooker.
A cooker in a property we let has just failed a pat test because the temperature markings have worn away. Is this really a pat test failure? As I can't see how it is actually dangerous. Also we have been advised that the cooker will have to be replaced. Is it not possible to just buy a sticker...