"we still have austerity to deal with"
We chose not to by re-electing the Conservatives but with a much reduced majority. Continued austerity and efficiency measures rather than tax increases is the Policy pending Brexit unless we have another Referendum or Election.
With the two major Party's as divided as ever on the question of Europe, who knows what the next few years will bring. If we decided to change our mind and stay in, would the EU allow us to continue with all our opt outs and outside the Euro. I suspect not. It's a story that just runs and runs as it has done since 1973!