EBJ123

Hi For travel expenses for employees working for a company, if they start and finish their travel from home but their place of work is the office, can they claim the whole amount of travel to see a client if they don't go to the office that day or do you claim for the shortest journey? i.e client is 20 miles there and back from employee but only 10 miles total from the office so you would claim the 10? Can you also share where the Triangulation guidance is too please? Thanks