Yes, please, download it, then put it on here. You may have to use a hosting site as per the forum "Read this first...."thread.
The busgate signs seem clear enough, although it is disgusting to me that the road layout and markings are left totally unchanged, so there are no environmental clues that the road is blocked to motor vehicles
I backtracked from your GSV link and found that there is advance warning of the bus gate: -
https://maps.app.goo.gl/H6DCK5zoBkVQNcTR8If these advance signs had not been present your case would be quite strong, but if you get as far as adjudication, the council will point out this advance warning. Were you using a satnav ?
Usually a council will re-offer the discount when rejecting representations received within the discount period, so you could submit reps on the basis of total unfamiliarity with Bristol, and ask for this to be considered in mitigation of your transgression. Post up their response when you get it.