Thanks for your response Nicolas. You’ve confirmed my suspicions.
The issue is I am using charts from IG (with IG pricing), but I want to calculate my Pivots/custom indicators using the real market prices from the previous day rather than the IG prices from the previous day.
I therefore enter the cash High, Low, Close manually into my indicator parameters and my indicator then gives me all the horizontal lines that I need for the various support/resistance levels.
I don’t think there is a way to access the cash market High/Low/Close from the IG PRT charts – unless you know different. So I guess I will have to stick with the way that I am currently doing this.