Really they cannot expect me and mine to welcome them!
Yes its devisory, same as not being able to drive a car without a licence, or being able to go abroad with a drug offence, or not having any money means you cannot have a holiday. If a person has no certificate to prove an attempt to block the virus eg a vaccination, then we do not want them mixing with us, irrespective of where "WE" are. Be it on an aeroplane, boat, holiday village, or a pub or hotel. So to those that do not want a certificate or test, then do not be upset when told not here thanks. The easiest way will be a certificate to prove you have had the 2 jabs etc. You will need jabs also to go to certain places for other diseases to other places and a certificate. So look for the "NO CERTIFICATE! THEN NOT HERE PLEASE" It may not become mandatory but it will be obligatory to do something!
Biting the hand that feeds IT
