That is correct, Ealing usually reoffers the discount so you might as well have a go.
Draft challenge:
Dear London Borough of Ealing,
I challenge liability for PCN EA58950783 on the ground that the alleged contravention did not occur. In order to create an enforceable restriction, the council is required to provide segregated lanes, otherwise there is no impediment to a motorist lawfully switching lanes at any time (as this is not prohibited).
An example of a correct layout is found for instance on Filton Road in Bristol, I refer you to the images at LINK1 LINK2 and LINK3 which illustrate the point.
At the location captured by your camera, there are no restrictions or prohibitions on vehicles changing lane at any stage, nor can the turn right arrow embedded into the traffic light array have the effect you think it does: if it did, then all traffic including traffic in the left-hand lane would be required to turn right.
In the circumstances, the alleged contravention did not occur.
Yours faithfully,
I will PM you some links to put in the representation, they will redirect to https://imgur.com/a/ncZLWjw https://imgur.com/a/5rObDyZ and https://imgur.com/a/us9bIvv but if you give them the links I'll PM you, we can use the click count to confirm whether they've looked at them or not (obviously do not click on the links I PM you as we want the click count to remain at zero). If they don't click on them, we can then prove they've failed to consider all of the evidence. If they say in the rejection that they've considered all the evidence, we've got them for lying as well.