It is unfair to place the burden of the lockdown on a single scientist. While Neil Ferguson was a crucial part of the decision to lock down the UK, he was not the only scientist to advocate for it. A majority of the public health community spoke out in favor of swift measures to fight the spread of the virus.
Even if another response could have been adequate, the UK was too slow to implement it, ensuring that a lockdown was needed.
Additionally, our knowledge of the disease has been everchanging. At the time, a lockdown seemed like the only option to slow the spread and help healthcare systems prepare for an influx of patients. This has not substantively changed. The degree of infection and death in the UK has only served to prove that a lockdown was necessary. Without it, the crisis would have likely been orders of magnitude worse. To lift the lockdown now would only serve to give up the progress made in slowing the disease, and risk the lives of those most vulnerable, all because of skepticism around a single scientist.