The OP could use an (the) example, if there is one, of why the NTK does not comply with PoFA.
At present, they'll simply be writing words but not understanding their application.
IMO, I think you should take a stab at the creditor not having authority to demand parking charges in their own name. This arises because their client, Everyone Active, manage the leisure centre under contract from Bristol City Council and occupy the site under licence which does not entitle Everyone Active and therefore their agent to demand parking charges as creditor.
You might as well. IMO, it's a better punt than 'byelaws'.