OK, so here: -
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It is a bay for disabled badge holders only (Blue Badge), subdivided into 4 spaces for vehicles. The single sign applies to the whole bay, and with no days or times, applies 24x7. If there were spaces for BBs and normal parking in the same bay, there would have been signs for each separate type of bay with double-dashed bay dividers, but there aren't.
Unfortunately, your knowledge of how bays are marked out is not correct, so in my opinion, any representations you submit to the council will be rejected. You do have the right in law to take them to the Traffic Penalty Tribunal where the full PCN penalty will be in play, no discount option. Again, I don't think you'd win there either.
Frankly, I don't think you have a good case, and sorry if this isn't what you wanted to hear. However wait a bit to see what the others say, as I may be wrong.