Resist the temptation to say "I want a job" – even if it's true, says Corinne Mills, managing director of Personal Career Management. "The employer is gauging whether you will take this job if offered and, if so, whether you are likely to stay for any length of time. If you appear ambivalent, they will be reticent about hiring you."

Empty assurances such as "this seems a nice place to work" are unlikely to be enough to reassure them, says Mills. "So do your homework beforehand. Find out things about their products, services, expansion plans, and working culture that appeal to you and which also show you in a good light for the role. For example: 'You've run some great innovative campaigns and I would love to be part of that creative thinking'. Deliver this confidently with good eye contact and energy."