I use IG to trade and I've become confused by the difference in price on International Consolidated Airlines Group (IAG) that owns British Airways.
On IG, the price quoted at close on 17 January 2020 was 671 GBP, whereas on most other charts it was much less. For example, on Bloomberg the price on the same date was 441.81 GBP and the price has never seen the heights of 600+ GBP.
Is anyone able to explain this to me? Still relatively amateur at all this!