https://www.slab.org.uk/guidance/aa-general-rules-for-travel-related-charges-client-should-travel-to-you-and-methods-of-travel/
As a general rule your client should travel to you.
You should only need to travel to your client if:
The cost of travel will not otherwise be chargeable to the Fund, except in the most exceptional circumstances.
You should consider the most economic method of travel, taking into consideration the time taken and the cost. For example:
As a general rule witnesses should travel to you to provide a precognition.
We will only pay for travel to a witness to take a precognition where we consider that: