Statutory Compensation Query

Hi,
Reading the guidance on here about Statutory Compensation has been enlightening. I was looking for guidance on a couple of things if possible:

1. Is Statutory Compensation still due if your recovery actions are non-quantifiable or you didn't take action to recover the debt (e.g. a staff member send a few emails and a couple of calls, but the cost is not recorded, or where an invoice is overdue by a month, but before you had the chance to take action it got paid albeit late)?

2. For local authority contracts, my legal advice has been that statutory interest overrides any contractual clauses that call for a lower interest rate. However, does statutory compensation also apply where no compensation (beyond interest) has been prescribed/agreed contractually?

3. We're looking at 6 years of late payments. If we were entitled to statutory compensation, has it always been £40/£70/£100 throughout the last 6 years? (I don't want to request the wrong amount for historical invoices)

Any help would be greatly appreciated,
Tom

Just nudging this old post of mine to see if anyone can help?
Thanks,
Tom