Good News - Mrs T's Carlton is all ready to be prepped and resprayed, and will have a sparkling NOS headtube badge when we get it back.
Bad News - My Carlton is not worth sorting (due to the expense of replacing BB shell or re-tapping threads etc), so no N+1 for me, only for Mrs T.
All this was discovered during a very informative chat I had over the phone with Mr Yates.