Rather endearingly, Lembit admitted he wasn't 100% sure but would call back if he found out any different. Good luck to him finding out anything. For reference, here is Clegg last month:
Has this now changed to a whole party sitting-on-the-fence on the referendum question? The Lib Dem position remains mired in confusion. The tragedy is that they could end up standing between the public and the referendum which all three parties offered at the last election.“
"We would vote against a referendum on the treaty and vote in accordance with our long-held position that the real referendum which needs to be had is whether we stay in the European Union or not."