Further to my previous post. Just noticed that in addition to the invalid flag, the IOTA field shows NA013, but the summary window does not show any "Worked" for this entity on 15m (where I worked him). Also I have this confirmed by the LOTW but not yet received a card. There's something very odd about this, any ideas please?
73's Mal G4KFT --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.554 / Virus Database: 346 - Release Date: 20/12/2003

