Sit down, be calm, take a few minutes to ready yourself ahead of going through the door.
Be cautious to talk poorly about your workmates, boss or industry.
Don't go off topic. Keep your brain on the things you are good at.
Be genuine, cheerful, attentive, forthright and to the point.
Say thank you to your interviewer at the end and after by email or send a 'thank you' letter by post.
Never be late. Plan for the unexpected.
Eat properly before - and no stinky ingredients!
Advice for Job-hunters:
"Find out about job adverts from many sites. No job board will list even a small serving of the possible jobs currently available. Touch base with old colleagues that you haven’t met with for a while. Try to ask and see if they’ve heard about someone hiring. Ex-colleagues are some of your finest contacts."