Unless there is a restriction that the parking doesn’t apply on bank holidays then it applies on bank holidays.
I can tell you now that the council have probably been quite shrewd here and have anticipated everybody treating a bank holiday Monday like a weekend and either forgetting to move their car or presuming that they didn’t need to. They have treated this like a little cash machine!
You can appeal this on the basis that the ticket is unfair and it’s unfair because of the reason the line is in place and it’s a bank holiday.
The Council will not routinely quash a parking ticket because it’s money for them.
I assume that you have been sent Notice of Rejection and your next course of action therefore is to take the matter to the independent adjudicator. It’s better if all 5 you do that at the same time assuming that all 5 of you have appealed to the council.
Bear in mind that you have now lost the right to pay the reduced penalty.
Here is the link to the Traffic Penalty Tribunal https://www.trafficpenaltytribunal.gov.uk/
and the good news is that it’s free.
There are different tribunals for London, Scotland and Northern Ireland.
Can I clarify anything else for you?
I’m happy to answer any specific points arising from this.
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