Social they could do. This was one of those places where Pansy knew the barista, and it wasn't very crowded, so she simply turned and called over her shoulder for a cup of tea.
A guy in a funny apron brought out a cup of tea for Sherlock in under a minute. He gave Pansy several hopeful smiles, but Pansy was too busy staring at the manila folder and Sherlock to notice.
"...I know it doesn't need to be said, but... let's just keep this between us for now. I don't want either Peter or Draco--my brother--to know that I've got this information."