Shoppers in England will face a 5p charge for plastic bags under a new government plan to be announced by Nick Clegg.
The scheme, intended to discourage the use of environmentally-damaging carrier bags, will be set out by the Deputy Prime Minister this weekend at the Liberal Democrat conference in Glasgow.
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John McDonnell promises voters they can expect to see "no increases in income tax for middle or low earners" in Labour's election manifesto.
The prime minister has confirmed the Conservative government will not increase VAT if they win the General Election on June.
Liberal Democrat leader Tim Farron insists his party can be the "strong opposition that Britain desperately needs".