51 points relegated Blackburn last season on gd.
People keep bringing this up but it's not the norm at all
This is the 10 years previous - 40, 41, 44, 54 , 40, 42, 47, 46, 52 , 42
44-45pts average
Given how shite like 5 or 6 teams are at the bottom of the Championship this season it'l surely be a lower number again. 20 pts to 46 will do it I'd guess