Photograph everything before you open it. Ten seconds, settles most disputes. A fortnight in on Royal Mail and it lines up.

File early. The window is shorter than people think and it starts at the transaction.

Half of what people describe as tolerance is a change in the underlying condition, and the two need different answers.

Log dose, time and sleep. Ten seconds a day and it turns the anecdote into something you can look at.

Check the register yourself rather than trusting the number printed on the site.