Some 77 cases of a variant thought to be behind a recent surge of infections in India have been detected in the UK.
"An unknown quantity" of milk flowed into the river, officials said.
The 94-year-old British monarch attended a retirement ceremony for a senior royal official on Tuesday, according to the Court Circular.
The aim of the study is to assess how well people's immune systems respond when their second "boost" dose is a different type of vaccine to their first "prime" dose.
Rachael Blackmore has smashed through one of the biggest gender barriers in sports by becoming the first female jockey to win the gruelling Grand National horse race.
"Protests have been postponed out of respect for the Queen and the Royal Family," read posters posted in Unionist areas of the city.
The study by Imperial College London also found that the relationship between infections and deaths is diverging, "suggesting that infections may have resulted in fewer hospitalisations and deaths since the start of widespread vaccination".
Kyaw Zwar Minn said that staff members at the London embassy loyal to the military regime prevented him from entering his office.
World War Two tunnels under the UK capital have been transformed into a space for urban farming.
Oxford University has paused a trial of the vaccine on children and teenagers until further review by the British regulator.