Many of the party's main pledges were in its manifesto, but some were also made later in the election campaign. The party said it would: Introduce a law guaranteeing no rise in income tax rates, VAT or national insurance before 2020 Invest an extra £8bn a year for the NHS by 2020 Hold a referendum on membership of the EU by 2017 Open 500 more free schools Extend the right-to-buy scheme to housing association tenants in England Build 200,000 starter homes Ensure all people who work 30 hours per week on the minimum wage pay no income tax Double free...