You’ve prepared and rehearsed, know the PD back to front and feel ready to tackle almost any question they throw at you. That is all really important, but you also need to allow them to get a sense of who you are, what makes you tick and whether you would be someone they can connect with on a personal level. Think about how you spend your spare time, what’s important to you. Don’t worry if your passion is extreme ironing, something a little quirky is interesting and can often be a springboard for a great, memorable conversation. Just be who you are, as that will be evident if you work there anyway.
If you’re overcome with nerves at any point, just tell them so. Show them how you handle tricky situations- do some deep breathing and give yourself a bit of time and space to think through each question before blurting out an answer.
The secret to success really is in preparation, relaxing and understanding why you want the role you’re interviewing for. Take a bit of time to work through these things and you’ll give yourself the very best chance possible to score the job.