It is a good sign, really, that they are very interested in you, Jonny. In some companies, one person interviews you to see if you are suitable for the job. Obviously you passed that test. Then everyone who might work with you has to meet you to see if they have any strong objections to hiring you. It is pretty clear that the first interviewer thought you were suitable, but he probably has to get approval to hire you from this managing director.
Another thing they might do is take you out to lunch with several employees at once. If they do, don't order very messy food, take small bites and don't chew with your mouth open or talk with food in your mouth. You probably already know all this stuff, but I will leave it in case someone else who might read this does not.
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Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods. - Albert Einstein