The Queen recalls her trips around the world as she tours Britsh Airways HQ to celebrate airline's centenary

The Queen happily recalled her millions of miles of travels on behalf of the country as she celebrated the centenary of British Airways today but laughingly admitted: "Having travelled so much they tend to get a bit muddled."

The 93-year-old, who does not possess a passport, is the most travelled monarch in British history, having visited 116 countries during 265 official visits.

As part of her morning visit to the national airline headquarters in Hardmondsworth, Middlesex, she toured the Speedbird Centre, BA’s heritage museum, and reminisced with volunteer Jim Davies.

"Very nice....lots of different travels to different places," she said as she perused the displays featuring some of her iconic trips around the globe.

She added: "Having travelled so much they tend of get a bit muddle."

Mr Davies, who worked for the firm for almost 36 years starting in the ‘booking office’ and then moving to customer services before his retirement, showed the sovereign a model of one of their older planes, named The Elizabethan.

"You don’t do that any more. You don’t name them?" The Queen remarked.

She was also shown a picture of her "christening" an Avro Tudor plane at London airport in 1947.

"On the day I believe you did it with cider," said Mr Davies.

"Cider?" asked the Queen, "not champagne?"

Her host explained that in light of wartime austerity champagne would have looked too profligate.

She was also shown the ticket for her first British Airways flight as Queen, six months after her Coronation in 1953.

It was for a flight for herself and the Duke of Edinburgh to Monetgo Bay in Jamaica.

"This is something that might amuse and interest you," said Mr Davies.

"Oh yes, I remember!" she said brightly.

She also admiringly membered the ‘smooth lines’ of Concord from her first flight on it, returning from Barbados in 1977, and her most recent BA journey, flying back from Perth without stopping in October 2011 on board a Boeing 777, with a journey time of 17 hours.

Mr Davies said: "I heard a story that you know exactly how much fuel was left when you got off."

"Yes," the Queen said, "the pilot told me there was enough left to get to Glasgow."

Then, with another impish grin, she laughed: "Which was quite a relief to hear!"