Gwen skids clumsily to a stop and watches the Doctor, on her heels again as soon as the other woman starts off. She wonders if she has a special alien sensing finger, or is just taking the piss. Either way, Gwen has to fight a grin.

"That depends," she says in response. "on if you mean 'much more fun because Jack isn't here.' In which case I would tend to agree!"

It's kind of fun for Gwen, you see, having the Doctor all to herself?

Her head whipped around. "I think I just saw something that way," she points down a typical, gloomy, foreboding alleyway.