A referendum on whether to elect members of the House of Lords would be unnecessary and expensive, Deputy Prime Minister Nick Clegg has said... “Unlike the referendum last year, [it] is the subject of complete consensus between the parties; we all had manifesto commitments to deliver House of Lords reform.”
B.B.C. News

Which, one might think, implies the opposite conclusion: that since it was impossible for anyone voting for one of the major parties to vote against an elected Upper House, public judgment on the matter was underdetermined by the election. Which is not to say that a referendum is desirable, merely that a cluster of manifestos resembling a Greek chorus is no strong argument against it.