OK Leo 49. Technically you are correct. My humble apologies. But with the original message buried in the past under dozens of others I thought that my polite thank yous would not be discovered by those who had helped me. I will go back tomorrow and tick the original thread as resolved.
As you can see Leo 49, I have followed your instructions and gone back and resolved the original message posted on 17/2, which, as I suspected, was now on page 7. Who the hell would have seen my thanks there?
Obviously I am not as experienced as yourself in forum technicalities. For example a search on various combinations of Lexmark and cartridges and refills did not get a result and it took me some time before I found the original posting. I will try to remember the my postings tip.