Could I make an addition to this, please.
Fairly often when I've posted an answer to a thread I get a response via email. I don't mind replying to the email but it is better for all concerned if responses are made to the forum rather than privately. This then enables others to see what is going on and either make a contribution or to remember the response for future reference. The thread also goes into the archive for possible later retrieval and a full record of the thread is the most help in the future.