Are the Blue Badge and single yellow not in play albeit there was no clock on display?
Yes no clock on display. However, does not the amount of the car being in the bay play a factor. I remember getting a ticket years ago in Haringey and this was the case. I remember using PPP but cannot find it anymore
Is this your Blue Badge? If not, whose is it?
And is it a Newham Blue Badge?
Your two front wheels are well over the end line of the parking bay so the front half of the car is fully in contravention of the yellow line, not just overhanging.
The three hour exemption allowing you to park on a yellow line only applies if the clock is also displayed, not just the blue badge.
That said, your PCN is dated Saturday the 24th May. So the discount rate applies until Friday the 6th June. Get a challenge (informal representation) delivered to the Council before the 6th June and the Council should reoffer the discount if they reject. So always have a go. You never know what might happen.
I suggest a humble and contrite plea for leniency. Terribly sorry, I didn't realise that I had to display the clock, if I had displayed the clock then there would be no reason for the PCN, it was an honest mistake, it won't happen again, there was no attempt to evade a parking charge, and so on in that manner. Ask them to use their discretion to cancel the PCN.
You can challenge online. Upload scans/photos of both sides of the Blue Badge when you do so.