Recieved from Babraham Research Campus:

On Tuesday July 12th, the Campus is hosting an exercise to test the major incident response plans of the emergency services. You will see a number of emergency vehicles, some sirens may be heard (will be kept to a minimum) and specialist equipment/people in protective clothing may be seen on site.

I am letting as many people close to the Campus aware of this as possible, to reassure local residents that it is part of a pre-planned routine exercise and there is no need for concern. It is also likely that those passing by the Campus may not see or hear anything, but I would be grateful if you could share this information to those in your reach, to avoid any alarm.