Don't worry Tim. I'll defend her when Mr. Plod feels her collar! And I won't even appraise her of the qualification! Peter , as nicked by the every lovely Frau Doktor (thank goodness she has one use) MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.