Memorise the NHS's 'core values', and those of the Trust you're interviewing for.
Be able to say how you'd meet them. 'OP, when you see 'Care', what does that mean to you?'... Give us an example of a situation where.....
Know when to say 'I'd do this, then this'; and when to say 'Having attempted that, I would seek advice from my line manager'.
Say 'I understand admin, including band 3, to be vital with the NHS; however, I recognise that admin is a cog, part of a bigger machine, and thus the importance!of team working.
Speak lyrically about the Team Effort the NHS is, while assuring them that, as a Band 3, you'd 'know your place'. 😂
Bear in mind it's all bollox 😂, given that the person who got the job ahead of you, before, 'didn't work out'...
Good luck!