Hiya
@gggg
Based on reviewing previous Kirkland applications, I don't think this is entirely necessary. Addressing the cover letter to Graduate Recruitment should be enough in terms of formatting.
That being said, I know Kirkland only look at direct training contract applications once they have had their vacation schemes and they do tend to fill the spaces from those schemes given their small intake - in some cycles they have made direct training contract offers to those who have applied through the vacation scheme route. This might be something you want to keep in mind when you decide which application route to take. Good luck with your application!