As Danniel Hannan points out in The Telegraph today, at the last general election the LibDems were calling for a referendum on the EU both in leaflets and on their web site.
The page on the web site has recently been removed, but the Telegraph provides a copy of the leaflet.
link to the Google Archive
Once again we are given a good reason for not believing a word that politicians say, and particularly for not believing anything that a LibDem says.
This site during the election
1 hour ago