Create your own tweetyourmp.com campaign.
Generate a pre-filled twitter message to share.
Create your link
This form generates a special bit.ly link which links to tweetyourmp.com with a pre-filled tweet to MPs. See an example here.
Constituency lookup by TheyWorkforYou.com script by Pete. Data updated March 2017.
Follow TweetyourMP.com on twitter - More about this tool (including data) - Download on GitHub