How much is it costing the Royal Mail to send cease and desist letters?

"A number of non-profit online services face closure today, after Royal Mail sent a cease and desist letter to free post code campaigners. The services affected include Job Centre Pro Plus, which allows you to find jobs near you. Royal Mail is currently looking to slim its workforce of 121,000 postal workers." This seems a stupid way to spend public money. Here's the rest of the background: http://www.tom-watson.co.uk/2009/10/post-code-address-file-tom-steinberg-and-i-would-agree-on-the-idiocy-of-royal-mail/