There are no credible sources to verify the number of people in the UK who contracted the coronavirus infection were from Pakistan.
However, the data is not publicly available. There is no adequate evidence to prove that about 50 percent of the UK's coronavirus cases are of Pakistan origin.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.