A quick recap...

What have we discovered so far?

Dealing with money + conflict isn't easy but it's essential for business and wellbeing.
You deliver the work. They deliver the payment. Simple equation.
This is business, not a favour - you're owed money.
Late payment means you're owed £40 + 8%, its not a threat, its the law.
Any questions or excuses need to come immediately, not after the due date.
Getting paid late isn't acceptable. Don't accept it.

So let's get practical - what is the timeline of an overdue invoice, and steps you should take?