WP HTTP error: cURL error 28

I have a daily feed run which has just come back with the following error:

4:27 am WP HTTP Error: cURL error 28: Operation timed out after 10000 milliseconds with 71560 bytes received

The plugin has not run correctly since this error occurred.

I have since downloaded the Core Control plugin to test/log the HTTP requests, and all appears to be working fine.