My brand new Dualit toaster just caught fire! So obviously sending it back to Amazon UK.
The central heating element between slots 3 and 4 is faulty. The lower half of this faulty element gets super hot and the upper half doesn't heat at all. This causes the inserted bread in sections 3 or 4 to remain untoasted in the top half but to burn in the bottom half and eventually catch fire!
[Dualit 46603 Domus 4 Slot Toaster]