thanks for that, turns out its only 3 months old so under warranty but i managed to speak to a hotpoint engineer who confirmed the change heater as fluff build up but also change pcb as that goes faulty as well,i priced the bits up and probably would have been ber ! due to cost
Just for info F01 is heater relay on the board. Personally I always replace the board and heater as a pair as you tend to get an F06 recall if you just change the board hope this helps