Article: On 9 March 2016, The Sun's front page proclaimed that Queen Elizabeth II was backing "Brexit", a common term for a British withdrawal from the European Union. It claimed that in 2011 at Windsor Castle, while having lunch with Deputy Prime Minister Nick Clegg, the monarch criticised the union. Clegg denied that the Queen made such a statement, and a Buckingham Palace spokesperson confirmed that a complaint had been made to the Independent Press Standards Organisation over a breach of guidelines relating to accuracy.

Now answer this question: With whom was a complaint lodged alleging breach of guidelines in accuracy after the incident involving Queen Elizabeth II?
Independent Press Standards Organisation