We have just replaced our hob and therefore have available a BOSCH PKE615C01E ceramic hob.
One of the rings on the hob has stopped working (see photograph) and the electrician who fitted the new hob said that a replacement part could be ordered (he thought about £30 but this would need checking).
It is therefore available with (currently) three operational rings.
If you take it, I recommend you have it fitted by a qualified electrician.
Please let me know if you have any questions or if would like to have a look at it.
Thank you for looking.