We can consult—I mean, one of my colleagues always says “Independence doesn't mean isolation”. It's always been recognized in the jurisprudence that a DPP or an attorney general, in those jurisdictions where the attorney general is responsible for prosecutions, can consult with whomever, but the decision to start the prosecution, to continue the prosecution, to go on appeal, must be exercised independent of any partisan influence.
Evidence of meeting #71 for Justice and Human Rights in the 39th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was prosecutions.
A recording is available from Parliament.