Look up per diem reimbursement rates and mileage deductions for business travel worldwide.

Complete

United Kingdom → Queensland, Australia

Item Name	Destination	Amount	Conditions
Meals	Brisbane, Australia	49.5 AUD per day	Over 5 hours rate: covers subsistence expenses for a period of more than 5 but less than 10 hours, measured by reference to the times of arrival in and departure from the foreign country.
Meals	Brisbane, Australia	128.5 AUD per day	Over 10 hours rate: covers subsistence expenses for a period of more than 10 but less than 24 hours, measured by reference to the times of arrival in and departure from the foreign country.
Meals and incidentals	Brisbane, Australia	156.5 AUD per day	24 hour rate: covers the total cost of meals and daily hotel-to-office travel for a full 24-hour period.; The actual room rate is paid in addition to this amount (source shows the rate as 'plus room rate').
Lodging	Brisbane, Australia	291 AUD per night	No specific conditions
Breakfast	Brisbane, Australia	18.5 AUD per meal	No specific conditions
Lunch	Brisbane, Australia	44 AUD per meal	No specific conditions
Dinner	Brisbane, Australia	73.5 AUD per meal	No specific conditions
Incidentals	Brisbane, Australia	0 AUD per day	Source row labelled 'Other': other expenses incurred during the day; employers may use the individual meal and other rates instead of the over 5 hour, over 10 hour and 24 hour rates.
Drinks	Brisbane, Australia	11 AUD per day	No specific conditions
Transport	Brisbane, Australia	9.5 AUD per day	Covers daily travel between the employee's hotel and office.
Total residual	Brisbane, Australia	156.5 AUD per day	Total residual rate: intended to cover the total cost of meals in a period of 24 hours plus the cost of daily travel between the employee’s hotel and office; the 24 hour rate is the sum of the room rate and this total residual rate.

Source URL:
https://www.gov.uk/guidance/expenses-rates-for-employees-travelling-outside-the-uk
This source provides official travel rate information from gov.uk.