Are officers from GB police forces subject to same code of ethics as PSNI when investigating cases in Northern Ireland

You can view the full video here:   https://www.youtube.com/watch?v=9c10GbDeapE&list=PLikfacyYNQmiCZ3nHWmjAjqsr29R5Fw19&index=4 The full answer to this question can be found at 45 minutes 25 seconds 

Dolores Kelly - SDLP