Identical kits of its watercolours without the exclusive Sandringham branding are on sale online for less than half the price.
Last month Buckingham Palace announced that the 75-year-old monarch had been diagnosed with an unspecified type of cancer , which had been picked up after doctors treated an enlarged prostate.
The Prince of Wales had pulled out of doing a reading at a memorial service for his father’s second cousin King Constantine of Greece ‘for personal reasons’.
The royal, 46, looked solemn as she walked into the Royal Chapel in Stockholm with King Carl Gustav, Queen Silvia and her husband Prince Daniel.
The King has praised the “determination and strength” of the Ukrainian people in a message marking the second anniversary of Russia’s invasion.
The King met face-to-face with Prime Minister Rishi Sunak today, having previously spoken to him remotely from his Norfolk retreat at Sandringham following his cancer diagnosis.
The 75-year-old monarch has been staying at his Sandringham Estate in Norfolk since his shock cancer diagnosis was announced but he was back in London today.