https://www.slab.org.uk/guidance/aa-travel-costs-steps-you-should-take-to-ensure-costs-will-meet-the-statutory-tests/
You should take practical steps to ensure that the additional cost of travel is kept to a minimum.
The steps you can take include the following:
Giving details of the postcodes of the departure point and destination helps us to assess your account more quickly. We routinely check distance and duration of travel using various route planners. We will restrict claims that exceed the recommended duration or distance unless you explain why.