Queen Elizabeth served up jam sandwiches after Sir Ken Dodd was knighted at Buckingham Palace.

Sir Ken Dodd

Sir Ken Dodd

The 90-year-old monarch made sure Sir Ken's favourite lunchtime snack, which is also known as 'jam butties', were available in a "regal round shape" with no crust at the bash to mark the 89-year-old veteran comedian's knighthood.

According to the Daily Mirror newspaper, an insider at said: "The Queen is clearly a fan of jam butties and nobody realised she had her own regal jam butty mine until Sir Ken came to call.

"Her Majesty literally had her staff roll out the jam butties and they were dotted among the scones on every plate.

"Sir Ken has mined jam butties for decades, but was clearly tickled to be able to tackle round ones for the first time.

"If Prince William and Kate ever visit Knotty Ash with their children they are guaranteed a plate of jam butties - the traditional variety and the newly uncovered Royal round ones."

Sir Ken - who hails from Knotty Ash in Liverpool in North West England - was honoured by Prince William for his dedication to his art and his charity work.

He found fame playing Diddy Men characters in the 60s and is known for his unruly hair and protruding teeth and his red, white and blue "tickling stick", and quipped that he felt "highly tickled" to be knighted by the Duke of Cambridge.

He previously said: "Being a Sir is a curious feeling ... I feel the same. But It's lovely for my family and friends. I'm delighted and highly tickled."

The celebrated performer became popular in the 60s in the UK with his recording of Tears', which was the UK's third-best-selling single back then, rivalling The Beatles.

He became an OBE in 1982, and is still seen touring the country with shows which are famous for going on well past the curtain call.

Talking about his passion for performing live, he said: "One of the happiest things is the joy and pleasure it brings to your family and friends and then you say to yourself it is a great honour and I just hope I'll be worthy of it."

And he has vowed to continue performing despite turning 90 in November.

He said: "I won't hang up my tickling stick up, till I have to."