Signage does look confusing but the bay does have double dividers.But how are you supposed to tell which sign applies apart from the m/c being on top.
It doesn't look confusing to me, but then, I've been giving advice for some time on this forum and the now closed Pepipoo forums, so am reasonably up-to-speed on bays and signs.
The signs are placed on a pole at the dividing point between two separate bays that have, (incredibly !!!), actually been marked correctly. The signs are side by side with arrows pointing to their applicability. To the left motorcycles, to the right, other vehicles.
I think the key to your problem is your statement "As it was a Sunday I didn't fully check the signs as there are no parking restrictions on this road". Yet these bays and signs demonstrates that there
are parking restrictions. In addition, a quick look at Barbauld Road using GSV shows virtually the whole street with parking bays and restrictions on their use.
Sorry if this isn't what you wanted to hear; new restrictions do seem to catch out people who have parked regularly in a location over a long period, but it won't convince an adjudicator, I'm afraid.
There may be a 'technical' appeal based on Hackney mismanagement of the enforcement process, so wait a bit to see what the others say. Also please post the back of the PCN so we can assess the 'small print' for fatal errors.