The electrician comes to call as the induction hob circuit has been tripping the circuit breakers since we got back from holiday.
Two possibilities:  the Miele Hob (££££) has failed or (unlikely) the wiring has a fault.  
Amazingly twas the wiring (dead short Live to earth  

) but it still took over 3 hours to get it diagnosed and fixed. I await the bill with some concern.