Basically, you chanced your arm and lost. But don't cough-up straightaway; instead submit an informal challenge to the PCN asking for mitigation, in that it was Good Friday, so the nearby school was closed. Essentially you're asking for forgiveness and that is solely within the power of the council. They may give way, they may not.
The PCN looks OK, with no fatal errors. Wait a bit for others to contribute, but if you're submitting reps, they need to be at the council before the discount period runs out in order for them to re-offer it if they reject your reps.
