I've seen this situation years ago on the old Pepipoo web forum, except in that case the car was literally alongside the white hatchings, but on the pavement. This was London, so a CEO with any knowledge should have served a PCN for parking off-carriageway, but instead served one for being on the hatchings. However, the law on these is that the No Stopping restriction applies to the area within the area bounded by two sets of white hatchings, but not any area outside these.
The Zebra, Pelican and Puffin Pedestrian Crossings Regulations and General Directions 1997 has all this, but it's quite hard to find the necessary clause to quote here, but the white zig-zags define a "Controlled Area", and Regulation 20(2) states that drivers must not stop within the controlled area, except, (obviously, if the crossing is in the pedestrians favour). A 'Controlled Area' is that area of the carriageway between two white hatched markings.
So any vehicle parked or stopped outside the "Controlled Area" is not in contravention, but may be in contravention of another restriction, like that banning parking off-carriageway applicable in London since the 70s.
So you should submit representations that state that the vehicle was not parked with a "Controlled Area" as defined in the Zebra, Pelican and Puffin Pedestrian Crossings Regulations and General Directions 1997, therefore the PCN is void and must be immediately cancelled. Needless to say the council, whose staff are totally ignorant of what the regulations state, will reject these, and you'll probably have to take them to adjudication.
You are not opposite the double-yellow lines so a PCN based on these would also be invalid. Strangely, your car is parked where there is no civil contravention at all, unless Leicester has a special regulation banning off -carriageway parking.
As far as I can see the only thing you could be walloped by would be a Fixed Penalty Notice for 'Obstruction' issued by a police constable.