This factory has conducted every measure but still couldnt avoid the outbreak

Where does it say they did everything they could?
Presumably the workers go home and mix with outsiders and theur own families?

The news said "

She added: "It is evident that Greencore has highly effective measures in place and they continue to work extremely hard to exceed the requirements needed to be Covid-19 secure within the workplace."


The key is, w/ good ventilation in place, even there are some patients in the factory, the rest of employees can still be protected from getting infected due to the greatly lowered contents of virus in the air.

https://www.thesun.co.uk/news/uknews/12394879/northampton-lockdown-sandwich-factory-coronavirus/
It is understandable that ppl are scared when they think they've done whatever they could do yet still unable to contain the spread of the virus.
But, could they have been missing one thing - Ventilation?
My guess is they might be working in a closed environment w/ a large number of workers in it.
My intuition is that in an indoor environment 2m distance is NOT enough. Actually, even 10m, 20m may still be not enough!
This is bcs the static air in a closed room will eventually accumulate the concentration of the virus to an infectious level, if there is one patient in it.
Moreover, if the air conditioner is used in the factory, the chance of getting infected will be drastically increased, unless the AC is working under Fresh Air mode. Unfortunately, most AC doesnt support that mode.
If poor ventilation is indeed the cause, the solution is actually very simple: Just keep the air refreshed all the times. It doesnt even need to done w/ a fast airflow - once fresh air starts to move in, the concentration of virus will be lowered tremendously, even the air flows at a very low speed.
Anyone who has the info about the ventilation condition in Greencore pls publish that info here. We need to find out the root cause otherwise this country will continue to suffer from the virus.

I think we need to go back to basics. The virus is minute. Smaller than a bacteria. It infects by being inhaled or enters through the mouth / nose.
The virus doesn't understand the rules
The virus does adhere to the 2m rule
The virus doesn't care about social distancing
If it enters through your mouth or nose uou will get it. Surely more airflow just means scattering the virus around everyone socially distanced in an enclosed space?

The news said "

She added: "It is evident that Greencore has highly effective measures in place and they continue to work extremely hard to exceed the requirements needed to be Covid-19 secure within the workplace."


The key is, w/ good ventilation in place, even there are some patients in the factory, the rest of employees can still be protected from getting infected due to the greatly lowered contents of virus in the air.

I think we need to go back to basics. The virus is minute. Smaller than a bacteria. It infects by being inhaled or enters through the mouth / nose.
The virus doesn't understand the rules
The virus does adhere to the 2m rule

Not necessarily... that is not how viruses work.
It does, on the same token though given there are billions of err bits of virus (completely forgotten the technical word for it) in the air, it has a better chance of diluting it. Inhaling but a couple of strands of the virus may or may not infect you, getting a faceful of sneeze from an infected person has a much better chance of doing it. As with drugs, number of times crossing the road without looking etc. more is worse.