Often the supervisor will have a chat with the external in the days leading up to the viva. It's not unusual for hints to be dropped which the supervisor can then pass on to the student ahead of the viva.

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We'll all be standing in your corner Chuff and we'll wave you off to fight a good fight and I'm sure you'll come back a winner and well chuffed!!!

Thanks Delta, appreciate it.

@ Pz  I shall have to inadvertently contact my sup a few days before then, thanks for that.