Maria (Now or Thereabouts)

Maria was a childhood friend of Ceol.

The two of them stayed in touch after Maria moved to America. Several years later, they drank lager together on the South Bank of the Thames. (PROSE: Now or Thereabouts)

Behind the scenes
As Ceol is heavily suggested, but not explicitly confirmed, to be Kelsey Hooper, from The Sarah Jane Adventures story Invasion of the Bane, this would implicitly mean that Maria is Maria Jackson. This is further suggested by the fact that Maria subsequently moved to America, as her SJA counterpart also did.