I often get requests from constituents to sign EDMs in the Commons on a range of issues. They are short Motions from MPs pushing forward an opinion on an issue. I explain a little about them here.
I've never signed them out of principle as they don't achieve anything and each one costs money to administer. However that doesn't mean the issues that they relate to don't matter to me, I'll always take things up direct with Government in a more effective and efficient way!