My ~£300 Tannoy powered subwoofer for my home theatre failed recently. They refused to honour the 10 year warranty because my proof of purchase wasn't in the r

My ~£300 Tannoy powered subwoofer for my home theatre failed recently. They refused to honour the 10 year warranty because my proof of purchase wasn't in the right format or some such. Surely proof is proof? I paid the same money as everyone else. Well, luckily for me, I have a degree in Electronic Engineering, so a week or so of reverse engineering and a few hundred £s in test equipment later I replaced the 20p Schottky diode which has failed and I have a working sub. First manufacturers need to put their money where their mouth is regarding warranties, not have stupid obtuse get out clauses. Secondly, fuck Tannoy, and all associated brands, they just lost a customer for life over this, so much for buying "British" as a Brit, I'll vote with my wallet. Taking brand suggestions for future purchases who treat their customers a little better.