We have seen this location several times now, and appeals have been won at London Tribunals. This is a PCN from venal and rapacious Havering council, who do not re-offer the discount when rejecting representations. This means that if you submit representations to them, it is on the basis that they will reject them, as they always do, and you then register an appeal at London Tribunals. It is this or just cough-up and join the MUugged CLub.
Here are the signs you passed which are not at the junction of South St and Eastern Road: -
Find local businesses, view maps and get driving directions in Google Maps.
There are two things you could argue cancellation of the PCN on: -
1. The PCN, and video does not show you passing any traffic sign barring motorvehicles.
2. You required access to the railway station and car park on Havana Close, so dropped off your passengers there, then parked in the multi-story car park
See this this case at London Tribunals: -
HG61116639
This covers inadequacy of signage and also access to premises.