1% would be an insane failure rate for something this dangerous. Over half the households in the UK own driers [1] and there are 27.7 million households in the UK [2]. If 1% of driers were catching fire we would be seeing 138,500 extra house fires a year! Even 0.001% is too high.

[1] https://www.statista.com/statistics/289140/tumble-dryers-in-... [2] https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...