https://www.slab.org.uk/guidance/factors-to-consider-and-payment-implications-when-instructing-local-agents-for-your-abwor-accounts/
General rules:
If someone other than the acting solicitor can deal with the matter then consideration should be given to instructing a local solicitor, due regard being had to economy [Regulation 17 of The Advice and Assistance (Scotland) Regulations 1996]. Additional costs, such as travel, would probably be unreasonable and may be the subject of abatement.
You should take various matters into account in deciding whether to instruct a local agent:
If you have dealt with a number of other cases on the same day, thus diluting the travel costs, the personal attendance may not be an issue in the particular account. However, a number of attendances, none of them justified, will not be enough to substantiate additional travel costs.