How important are the parties' Brexit pledges to voters?

Is this really the 'Brexit election', or do voters care as much (if not more) about other issues? Heinz Brandenburg (University of Strathclyde), Fraser McMillan (University of Glasgow) and Marcel Hanegraaff (Universiteit van Amsterdam) tested the relative importance of Brexit vis-a-vis health, education and the environment. They found that Labour supporters are less attached to ensuring the party fulfills its pledges on Brexit than Conservative and Lib Dem voters.