ok, I have figured out a real simple solution to this. I use entity syntax to write out a phone number in the code, which is not recognisable by Skype but translates to regular numbers on the page, kinda like when you write " for quote marks.
For a full list of syntax see
http://www.w3.org/MarkUp/html3/latin1.html
You can write anything in syntax so it cant be read by spambots -email for example - and other programs, but still looks like regular text once rendered on a webpage.
Hope this may be of use to others