The Lib Dems have named £15bn of specific cuts initially including Child Trust Funds and a public sector pay cap, and said that more cuts are necessary (as the party believes the structural deficit is £70bn). You are right that there are no specific cuts identified for that yet although the party have said they will look at public sector pensions and the cost of replacing Trident. I do think all the parties should be open about the scale of deficit, whoever gets in will regret not doing so when they have to govern. But as NCC has found out, it's one thing to say we need to stop spending money we don't have, and another to actually name the things you'll have to cut.