They have already replied which seems incredibly quick! They haven't even mentioned the road closure part of it, and focused on the unloading.
Here is the text to save reading the image:
1. Our reasons for rejecting your representations:
The contravention was noted by the camera operator who was observing real-time images relayed from a fixed CCTV camera. Video footage was recorded of the contravention taking place. Should you wish to view this footage, please go to the following website
https://buslanepayments.essex.gov.uk and follow links to pay/appeal your PCN. When prompted, enter your PCN number and vehicle registration details. The available evidence can then be accessed using the 'View Evidence' button towards the bottom of the screen.
Only designated vehicles are permitted to drive in bus lanes. By driving in a bus lane you are obstructing the road for these vehicles and causing delays for public transport users. Enforcement of traffic regulations is vital to keep traffic moving across the city.
The Penalty Charge Notice (PCN) was issued to you because your vehicle was seen in a bus lane when it was not permitted to be there.
I have investigated the circumstances raised in your correspondence and have made the decision not to cancel your notice. The reasons for my decision are set out below, along with the options available to you at this stage.
You have stated in your correspondence that you were unloading goods and needed to move your vehicle to a parking area.
It was not necessary to use the bus lane to move to a parking area. Buses, motorcycles, emergency service vehicles, and licensed taxis/private hire vehicles are the only vehicles permitted to use the bus lane. Regardless of why drivers are travelling along that route, any other vehicles are not permitted to use the bus lane.
https://imgpile.com/p/T1axIZc#gallerySo now it's whether I take the risk to appeal or not.