By parking this way, you are actually in contravention regarding parking out of a bay(the whole axle is outside) and prospectively in contravention of the dropped footway and yellow line restrictions.
Unfortunately, councils are not interested in your good intentions, only money.
But make reps no later than 4th to secure the discount.
You suggest that you've seen other Civil Enforcement Officers, if so did the uniform in view in your photos correspond and does it satisfy the following:
When exercising prescribed functions under TMA section 78(2)(a) and (b) and section 79 and RTRA, section 99, a CEO must wear a uniform as required by TMA section 76(3)(a) and the Civil Enforcement Officers (Wearing of Uniforms) (England) Regulations 2007. The uniform should clearly show that the wearer is engaged in parking enforcement, the name of the local authority/authorities of whose behalf they are acting and a personal identity number: