LONDON (Reuters) - A group of scientists said on Monday that British Prime Minister Boris Johnson’s “Operation Moonshot” plan for mass coronavirus testing, intended to allow large parts of the economy to reopen, was likely to be ineffective and expensive.Slovakia says mass testing has allowed it to reopen theatres, cinemas and churches, and the Chinese city of Wuhan, where the coronavirus is thought to have originated, tested its whole population in May. The scientists acknowledged that Britain’s existing “test and trace” scheme, focusing on people with symptoms, had been plagued by difficulties. But Professor Allyson Pollock, Clinical Professor of Public Health at the University of Newcastle, told reporters the evidence around rapid tests was “poor and weak at the moment”. “We’re arguing the ‘Moonshot’ programme really should be paused, until the cost-effectiveness and the value for money of any of these programmes is well established,” she said.