Why is my oven losing heat. Whirlpool AKZ151?

First of all the fan should not stop. which is odd because it should only switch off after the oven has cooled down. Secondly if the light for the oven is flashing alternately with the grill light. That is even more odd.
There is nothing on the internet or user sites about this one so as a last resort try: http://www.hotpointservice.co.uk/book-an-engineer/ They do a fixed price repair no matter how many parts it takes.
ps It may be to your advantage to just to mention the fan going off then ask the price.

GB in Wales
February 2013