The UK Green 2015 manifesto was produced on an anti austerity basis, suggesting significant changes to the tax system to ensure the deficit was dealt with, without the need for austerity. Working with Plaid Cymru and the SNP, a formal partnership was established to delivery an anti-austerity agenda for all three manifestos.
During the election campaign, the Leader of the Greens in England and Wales, Natalie Bennett struggled under questioning how the Green manifesto could be funded. The General Election saw no additional Greens being elected to Parliament. Natalie Bennett standing in her home seat of Holborn and St Pancras, suggesting she could gain the seat from Labour eventually came third, but increased the Green vote share by more than 10%. The Greens only MP, Caroline Lucas, was re-elected with an increased majority for the Brighton Pavilion constituency.