Gig 601XL Builder writes:

Britain's Air Accidents Investigation Branch (AAIB) is recommending that
student pilots on solo flights be identified by a radio call-sign prefix so
air traffic controllers can take into account their limited experience and
knowledge.

Will this also apply to inexperienced air traffic controllers?

Student pilots are advised to tell ATC that they are student pilots; I don't
see any reason why they must be "flagged." They are not trying to keep it a
secret.