As I understand the government statement today (Sunday).
The government in the next few days will be setting up 'hubs' in towns and cities across the country, and that there will be a chance for people to volunteer for all kinds of work.
Not sure if the hubs will be where to offer to volunteer or how the recruiting will be done. As I said, not yet set up but probably will be very soon. One to watch for anyone who is thinking about volunteering.