How do you mitigate the risk posed by bad weather?

In the UK this past week, we've had snow, ice and freezing conditions affecting the postal services, the road, the telephones...

With the snow still falling the temperatures continuing to plummet, the entrepreneurs at http://www.inafishbowl.com are carrying on as best they can. However, Mike and Bea of betterlanguages.com have raised an interesting question...

How can you mitigate the risk posed to business by bad weather? What
provisions do you have in place to ensure your business can carry on
whatever the weather?