Belgium: British Missions And The Union Flag Lord Tebbit asked Her Majesty's Government:Whether they will instruct British ambassadors in Belgium that the Union flag should be flown each day over each British embassy in Brussels. [HL949] Baroness Scotland of Asthal We have reiterated the general rules of flag flying: British missions are expected to fly the Union flag on working days during office hours. Ambassadors have discretion not to fly the flag where this could pose a security risk or offend local sensitivities.