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

Complete
Ireland → Wales, United Kingdom
Item Name Destination Amount Conditions
Meal & Lodging London, United Kingdom 199.29 GBP per night Overnight rate covering accommodation and three meals for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate London, United Kingdom 99.65 GBP per night Vouched Accommodation (VA) rate: paid in addition to the vouched cost of accommodation. Per Note 2 of Circular 07/2017 the VA rate should not be routinely used except for travel to Brussels, where the vouched cost of room plus the VA rate applies to all officers on overnight visits.
Daily allowance London, United Kingdom 66.43 GBP per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance London, United Kingdom 33.22 GBP per day Five-hour rate: applies to an absence abroad of between five and ten hours.
Meal & Lodging Northern Ireland 118.7 GBP per night Overnight rate covering accommodation and three meals for a 24-hour absence abroad on official business.
Vouched Accommodation (VA) Rate Northern Ireland 59.35 GBP per night Vouched Accommodation (VA) rate: paid in addition to the vouched cost of accommodation. Per Note 2 of Circular 07/2017 the VA rate should not be routinely used except for travel to Brussels, where the vouched cost of room plus the VA rate applies to all officers on overnight visits.
Daily allowance Northern Ireland 39.57 GBP per day Ten-hour rate: applies to an absence abroad of ten hours or more without an overnight stay.
Daily allowance Northern Ireland 19.78 GBP per day Five-hour rate: applies to an absence abroad of between five and ten hours.

Source URL:
https://www.revenue.ie/en/employing-people/documents/dper-circular-07-2017-subsistence-allowances-abroad.pdf
This source provides official travel rate information from revenue.ie.