So, I have had two replies from the help desk, and it's a cautionary tale. The first one said I had made a mistake with the registry. It should be Principal Registry, not Worcester, they said. They sent me a screen shot of my order, which showed that I had stated the Principal Registry! The second response was a form letter:
Dear Customer. We are currently experiencing some technical issues with our online ordering service, which are causing some customers to receive an error message when attempting to change their passwords. Our IT team is currently investigating this problem, and it appears to be a temporary glitch that has affected a limited number of customers. In the meantime, we recommend ordering a hard copy whilst we are trying to solve the issue.
Of course, as I pointed out to them, I have had this problem since 2022, so it is not a temporary glitch in my case. Nor am I trying to change my password! I will not be ordering a hard copy, because I live in Canada and cannot write them the cheque they say is how I must pay. A banker's draft would make this expensive too. I am not at all impressed with this service, I'm afraid!