The Cabinet Office said the right to vote in UK elections for Commonwealth citizens who live in the country "reflects our close historical ties with Commonwealth countries."
A Cabinet Office spokesman said: "Excluding Commonwealth citizens would be a significant step and would require careful consideration.
"Parliament has previously taken the view that these rights should not be changed."
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A top temperature of 11 Celsius (52 F).
The event, which was held at the Dorchester Hotel last Thursday, was attended by representatives of some of Britain’s biggest companies.
Reports in the Daily Mail and the Telegraph said published guidance has been changed for 2018 to only fly the Union flag on Remembrance Day.