That's not too surprising really. While Labour and Conservatives (And republicans and democrats of course) are both effectively two wings of the same ruling party, the conservatives have always been much more blatant in their right wing social darwinism. Their entire thing is to appeal to people who are comfortably well off, have a mortguage etc. And are somewhat secure usually by appealing to their greed and fear.

There really aren't that many milennials who have the level of financial stability needed that they'd believe the conservatives would benefit them and not target them.