Wish I could be more helpful Rayna but all I can say is that we always arrive in the morning.
I think if you've got everything ready you'll just hand over the 'bundle' together with a self-addressed and postage paid envelope and that'll be OK.
Just be sure you photo meets specification.

There's a couple of pretty good Japanese stores in the area

Have a nice trip to London, hope the weather will be kind for you.

Don't spend too much