BBC Wales Graphics, sometimes credited as BBC Wales Graphic Design, is a department of BBC Wales itself, and not of the Doctor Who production office. It provides graphical design to the various shows that are produced at BBC Wales. Its work has usually been uncredited on most BBC Wales programmes. So far, it has mostly been specifically credited on Doctor Who and Torchwood, but it has also been part of the Merlin franchise, inasmuch as they've provided graphics for the related documentary program, Merlin: Secrts and Magic.
Russell T Davies once specified the work of BBC Wales Graphics:
You know who never gets any credit is actually BBC Wales Graphics, cause The Mill does all our digital stuff, but computer stuff — stuff that appears on computer screens — is BBC Wales Graphics, and I think they do a lovely job.
He went to have a conversation with Peter McKinstry in which they both agreed that Graphics' workload on Torchwood was generally more intense than what obtained on Doctor Who.