London B2 request for SAR 221g

Hello Asking for relative: recently applied for B2 at London. Interviewer declined with 221g letter wanting police Subject Access Request (due to arrest but no charges - certificate provided).

Submitted Subject Access Request results.

Notice the visa site now shows a different courier address than originally chosen (London!) And other info shows missed interview.

Should we be worried? Can we change the courier point if B2 approval given? What's the usual drill for this situation of needing the SAR?

Thanks in advance!