From a future trainee:
"It's not a problem. I didn't complete a telephone interview (this may be because I applied for a straight TC) - I was invited in for first interview then called back for the assessment day. However, my first interview was heavily focussed on competencies - it felt like I was just thrown 15-20 questions, so felt quite intense. They were all the pretty standard questions, just a lot of them e.g. team work leadership difficult team member time failed/weakness and how you overcame this etc commercial awareness something in news find interesting So, based on my experience, I would say focus on competency & strength based questions. But, like I said I did not apply for the VS so my experience may have been different for that reason. Hope this helps!"