It's not a marked parking bay, the end of the sub-divided free parking place can be seen ahead of the car. In addition, the DYL mean that one may not wait, which includes parking at that spot.
What other drivers might do is not something which an adjudicator would take into account.
On the basis of what can be seen, you're bang-to-rights on the contravention because the whole of your car was parked other than on the carriageway.
But what's the authority's take and could this be used to your advantage?
Depends how you present your reps.