Was it 12 years, or up to 12 years? As model reported was built between March 2006 and July 2009. Could be a nearly 8 year old model. https://www.hotpointservice.co.uk/fridgefreezer
We have the same problem with our Zanussi Gas Hob, within 12 months all the markings had worn away on the knobs and metal surrounds.
It sounds a little like you expect old appliances to catch fire just because they are old! Just because something is old, it does not mean it has to fail, especially in a catastrophic manner.
Sure they are whirlpool but i always get ikea ovens as they come with 5 years warranty and are decent quaity for anyone looking
It was a 12-year old fridge-freezer that started the Grenfell fire. Is that just outside the warranty?