June 30, 2009 8:06 PM BST
I came across this web page
http://www.pfc.org.uk/node/346 which is a bit outdated but very interesting reading.
I thought maybe TW should follow this up and add this as a feature on this web site as for sure it's good information to know but as said, it's a bit outdated so I thought with some help from other members it could be up to date and maybe added to the menu as a new feature?
xxx Natalie