You can use this as a resource for pre-submission checks on non UK/Ireland nationals. Firstly, check the Home office website to see whether you need a VISA in the first place:. https://www.gov.uk/apply-to-come-to-the-uk
The requirement for Locum Vet jobs since the UK left the EU on the 1st January 2021 has exploded. A large percentage of the global veterinary contingent was already strained due to Covid making locums return home. Mainly to be with family and friends, or for fear of getting ill while living in temporary practice accommodation.