We are travelling from Northern Ireland to Spain this week and all adults in our group are fully vaccinated except for one. We assumed that only the unvaccinated adult would have to isolate for 10 days on return but I read a thread earlier saying that if travelling back to England from an Amber country then the whole party has to isolate if someone in the group is unvaccinated. Is this also the case for Northern Ireland - I have read through the rules but I can’t see this stated anywhere.