Case T-177/22: Judgment of the General Court of 17 May 2023 — Chambers and Others v Commission (Civil service — Members of the temporary staff — Members of the contract staff — Reimbursement of expenses — Travel expenses — Consequences of the departure of the United Kingdom from the European Union — Place of origin located in a third country — Withdrawal of entitlement to annual flat-rate payment for travel expenses — Error of assessment — Equal treatment)