checklink:

When I use 
<http://validator.w3.org/checklink>http://validator.w3.org/checklink  for 
http://digestivedistress.com   I get the error message:

<http://www.hon.ch/%20HONcode/%20Conduct.html?HONConduct961242>http://www.hon.ch/%20HONcode/%20Conduct.html?HONConduct961242 

What to do: The link is broken. Fix it NOW!
Response status code: 404
Response message: Not Found
Line: 140

but the actual code on line 140 is:
<http://www.hon.ch/HONcode/Conduct.html?HONConduct961242>http://www.hon.ch/HONcode/Conduct.html?HONConduct961242 

(there are no breaks or spaces in the line of code)

Why has W3C inserted "%20" before "HONcode" and "Conduct..."

The link as I have it coded goes to the correct destination whereas the 
link with the "%20" goes to a different and incorrect page