What makes a submission useful
The two figures that matter most are the first offer and the final settlement. The gap between them is the entire point of the dataset. Mileage and trim matter because they are the two things most often disputed in a valuation.
Whether the appraisal process under section 128 of the Insurance Act was used is worth recording separately. It is a formal route — each side appoints an appraiser and they agree an umpire — and it is invoked rarely enough that nobody has a good sense of how often it changes the outcome.
Why there is no identifying information
This form deliberately does not ask for your name, email, VIN, claim number or policy number. A dataset about settlements is only safe to publish if it cannot be traced back to individual claims, and the simplest way to guarantee that is not to collect the identifiers in the first place.
The insurer field is optional for the same reason — it is useful for analysis but nobody should feel obliged to name their insurer to contribute.