Buckingham Palace
Buckingham Palace under fire for leaving windows open Getty

Royal officials have been criticised after 25 windows were left open at Buckingham Palace.

TaxPayers' Alliance chief executive Jonathan Isaby compared last week's mistake when temperatures plummeted to -3 degrees to burning cash in a fire.

It reportedly costs £1.1m a year to heat the 775 room palace.

"Closing windows on cold days is just common sense. Taxpayers don't have bottomless pockets," he told The Sun.

A spokesperson for Buckingham Palace said some of the windows on the top floor were left open during maintenance work and redecorating.

The union flag was also flown at half-mast at Buckingham Palace following the death of King Abdullah of Saudi Arabia which provoked controversy last week.