Furthermore, reports cited that the two royals arrived separately by vehicle and helicopter as they observed social distancing; however, both Her Majesty and the Duke of Cambridge appeared at the event without wearing masks.
Today, the 94-year-old sovereign ventured out for her first public engagement outside of a royal residence since the start of the coronavirus pandemic.
It is the first time the Queen has ventured from a royal residence, outside of her household of reduced staff - dubbed HMS Bubble - to carry out her duties as head of state since before lockdown. Her Majesty and the duke visited the Defence Science and Technology Laboratory (Dstl) at Porton Down Science Park near Salisbury.
On signing the guest book Thursday at Porton Down, the queen quipped: "Well it proves we've been here, doesn't it?" Her Majesty paired it with a coordinating silk dress and hat by Rachel Trevor Morgan. She did not wear a mask, however social distancing was observed.
The Government recommends wearing a face covering in indoor places where social distancing may be hard and where the public come into contact with those they do not normally meet.
By now, pretty much everybody knows masks are a thing and they need to be worn to stop the spread of COVID-19.
It is a rare joint engagement for the Queen and Duke, who only generally appear together at family or major ceremonial occasions. Meanwhile the pressure group Republic said the Queen should have set an example by wearing a face mask.
In England, face coverings are compulsory in most indoor settings, including visitor attractions and entertainment venues, and in pubs and restaurants, unless seated to eat and drink.
Prince William also attended without a mask. The Queen arrived at the engagement near Salisbury via helicopter, and was photographed in her rose-coloured cashmere coat.
Since March, Elizabeth's only public appearances have been at Windsor for a military ceremony in June to mark her birthday, and for a ceremony to knight record-breaking charity fundraiser, 100-year-old Captain Tom Moore.
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The curfew aims to keep some 20 million people home from 9 pm to 6 am from Saturday - 30 percent of the French population. A further 88 people died in France after testing positive for Covid-19, according to the most recent daily figures.