Dr. Ronan Glynn:

I might ask Professor Nolan to come in in a second but I will make two broad points. The benefits which can be accrued from the roll-out at any point in time depend on where we are with the disease. If we can continue to keep this disease under control over the next couple of months and we have a significant proportion of the population vaccinated, that will give us much greater options than if it gets out of control and we are coming off another-----