Controlled Parking Zones refer to waiting restrictions on yellow lines and have nothing to do with parking places, which(subject to seeing their photos) is where you were.
Parking places are controlled by upright traffic signs whose times may or may not align with CPZ hours.
In your case there might be an exemption to the parking restriction in respect of delivering, so pl post this detail e.g. what type of loads, for how long were you parked, how many trips to/from your delivery destination were made, how far was this from where you parked, had you previous experience of doing this etc?
