I bought my TV april 2018
13 months ago we had a panel replacement for a known square box issue, PC world had no problem doing this.
Now we have screen burn, the usual banners,,, bloomin GMB, I wish ITV would do something about that and we have various other logo and central burn mainly on reds.
I have just phoned PC World and they were very helpful. The first thing they checked the details and told us it was still under guarantee, this is the cover they supply when paying that much for a TV (team knowhow).
They took me through a couple of tests with holding the power button and such and then went to youtube for a screen colour test, it was still there.
They must know this issue as they had no problem booking it in for a full repair in which I hope they put the updated panel in.
The phone number I used was 0344 561 0000 and it took me through the choices, I was connected to a engineer with 2 minutes.
All I said in the call was that it wasn't stated at any point not to watch the news, morning tv and so on and the tv had been used for general use and therefore was not fit for general use. The fact that PC World sold the TV with the knowlege that OLED has this problem means that "it was" faulty from day of purchase and was not fit for the purpose it is intended for E.G watching TV.
All I can say is that they were very helpful and are now repairing my TV.
I am not happy that the tech wasn't developed enough to withstand normal viewing but I am very happy with the way PC world has handled this.
I hope this post may help others.