Tribunal to hear Guardian appeal over security costs for royal family

The secrecy means that not even a rough figure for the total cost of security is known. Photograph: Jane Barlow/AP

Judges on a tribunal are to decide whether the cost of protecting members of the royal family can for the first time be disclosed to the public.

The Guardian will on Wednesday challenge the government’s refusal to tell the public how much of taxpayers’ money is spent on protecting King Charles and other members of the Windsor family.