I parked my car adjacent to double yellow lines as can be seen in the CEO's photos.
The Traffic Signs etc. Regulations and the Highway Code prescribe and describe where DYL must be placed, in this case: [On a road] 'Along the edge of the carriageway'.
As the contravention grounds in this case are predicated on my vehicle being parked in a road 'other than on a carriageway' the authority have a problem and one which should not be visited on motorists.
Either the location is or is not a carriageway.
If not, then the traffic authority is wrong for causing DYL to be placed there contrary to law. But if it is then the contravention could and did not occur because I was parked on a carriageway.
In either case, I hope authority will take the prudent course and cancel the PCN. What messages you might care to send to officers in the traffic authority I leave to you.