This is Katie (her who plays this weird lot), bringing in Rani Chandra from The Sarah Jane Adventures. She's fifteen years old, a reporter-in-training and is currently stood outside the apartments going "...wait, what?" because she's too young to have a place of her own. Poor dear.
Plottage for this lovely Rani is always welcome, of course - NessaroseT on AIM, or in the comments here.