The DYL adjacent to the alleyway do not prohibit loading. The sign which is obscured in the 2024 GSV is clear in 2023 and bans loading to its left, not right.
OP, you have until 25th to pay the discount.
OP, pl explain the issue of the trolley. In general terms, you should not take longer loading than necessary. If you had not had access to a trolley how would you have moved the load from where it was left and how many journeys would this have necessitated?
For example:
3 journeys' worth of load if carried by hand * 4 minute walk each way = 24 mins and your vehicle being left unattended initially for 8 minutes.
Whereas:
2 journeys' worth of load (walk to site, get trolley, load, return to car, load vehicle, return trolley to site then return to car) with 4 minutes(say) to load trolley = 20 minutes.
We need more info about the load e.g. boxed or loose, what form, quantity etc.
As you say, I think your use of terms caused the council to respond as they did. Depending on your details, better-worded representations could succeed.