E 2 error showing on display of Hotpoint model no. FF72P?

You must have missed all these when you tried doing a search for info yourself:

http://www.buyspares.co.uk/fridge-freezer/ff72p-f032917/thermistor/product.pl?pid=401754&shop=hotpoint&path=52514&model_ref=513091

http://www.ukwhitegoods.co.uk/forumsphpbb3/fridge-freezer-forum/installing-replacement-thermistors-for-hotpoint-ff72p-t50266.html

http://www.refrigeration-engineer.com/forums/showthread.php?10852-Hotpoint-Mistral-Thermistor-Problems

You DID try to help yourself, didn't you?
October 2015