Be sincere, cheerful, focused, self-assured, direct and succint.
Think of meaningful questions to express that you're curious and have thought about the company.
Say thank you to your interviewer at the end and after by email or send a 'thank you' card by post.
Check that recent linkedin messages are not unprofessional.
Interact, maybe, with the interviewer's linkedin profile.
Put on a clean suit. Wear it sharp and clean.
Suggestions for those looking for employment:
"Your CV will not earn the gig on its own. Its 'job' is to earn an interview. Make sure your CV garners the employers’ attention so that you can get the first interview - and then that is where you can earn the job."
Key things for this position:
Able to communicate efficiently with people from all levels and backgrounds
Commitment to teamwork
Confident and clear communication
Be able to effectively manage and prioritise your workload