Thanks so much for your response. Thats very helpful.
in terms of the Q&A thats where I am a bit confused. I had to change AC due to it clashing with one my LPC exams - they specified in the email that the one I was changing to wasn't for the London direct TC (it was TC London/Bermuda) and so the Q&A 'may not be relevant' - this sounded to me that they wouldn't be assessing me during this point. They also confirmed me switching to this AC would not be detrimental.
I am assuming I should just prepare more general questions to ask for the Q&A - as the trainees will not be from the exact route I am applying to - i..e, questions about the firm itself etc.
Please can I just ask whether your Q&A was very structured on the exact TC you applied for?