Okay so a bit of an update for your guys!
Since the last picture I posted with the glow exaggerated for the purpose of showing folks where it's strongest I've noticed the actual backlight has started to increase.
At first I thought my calibration was resetting or something but after playing around and checking I realised it was in fact the backlight bleeding through whereas in the first couple of weeks it was perfect.
I wanted to be sure before posting here and last night kept it on all day and recalibrated then took a set of photos which you can see below:
As you can see, it's vastly different to my photos from when it was still fresh and these photos are just using normal exposures at standard ISOs. You can see my brightness is on 11.
I had a livechat session with an LG person today who showed one of their technicians and they decided that the level of light shown was not acceptable and would repair it.
It's being collected by courier on Thursday who will arrive with his own packaging (a flight case supposedly!) and turnaround is estimated to be 5-7 days. I will have to buy a cheap 24" monitor in the mean time to tide me over I guess.
The LG lady said it would be going to a repair centre and not LG direct. I assume they will be doing what AWPC mentioned earlier about the panel being adjusted to the casing to stop the bleed.
There were no questions asked about the monitor being imported from Germany which was nice to see.
I wonder what has caused the backlight to suddenly start bleeding like this, perhaps this is why there's a stock shortage as batches are being held by LG as others have hinted above?