The idea that your choice of constitutional settlement would depend on companies having or not having to change their stationary is a new one! How many companies would this even involve?? Not that many I imagine in the scheme of things and for those who do have a Royal prefix..... Will they all use pre headed paper?? Surely many, I imagine even most companies, would only need to amend their PDFs for their headed paper. It is the 2020s ?? Why would they even need to change the name. Because of their history I could imagine they might keep it. After all the Kings Own Scottish Borderers kept that title for decades when there was no king. There would of course be some costs but hardly a deal breaker. Companies regularly upgrade or change their stationary etc. Why would road signs need to change??? That would affect very few surely? Honestly don't think stationary costs would be a major factor. No way it would be an issue with this monarch anyway as she is too popular and has aye been there. However popularity, maybe after an initial honeymoon, may well take a drop with Charles and Camilla.