Here's a service status page for our cloud suppliers

BT Service Status:
https://btbusiness.custhelp.com/app/service_status/

Easynet Status:
https://support.uk.easynet.net/support_status.aspx

Zen Broadband
https://status.zen.co.uk/

Office 365 Service Status
https://status.office365.com

Dropbox Service Status
https://status.dropbox.com/

Sales Force Service Status
https://status.salesforce.com/

Google Apps Service Status
https://www.google.com.au/appsstatus

Cloudflare Service Status
https://www.cloudflarestatus.com/

123reg service status
https://twitter.com/123reghelp?lang=en

Here is a service you can check to see if a website is down for just you or everyone

https://downforeveryoneorjustme.com/