Maybe newer Dualit’s have changed, but mine from about 10 years ago is going strong and never burnt the house down. Always reliable browning for the same setting.
Gone through loads of crappy plastic toasters, cheap and expensive. Variable results with each toast, levers that break especially the stop button (if they have one at all), and rubbish guides inside that allow wonky bread to get stuck. Plastic finishes discolour with heat.
Frequently non maintainable so bin and buy new. Dualit can always get parts for.