By Charlie Conchie Jeremy Hunt confirmed much trailed plans for a British ISA in the budget on Wednesday in a bid to get cash flowing into London’s beleaguered stock market. The move will look to incentivise investment into UK equities by offering tax breaks to retail punters after a slide in the overall amount of cash flowing into the market in recent years. The new British ISA, which will be launched following a three-month consultation, allows savers to invest an extra £5,000 tax-free in UK equities, on top of the £20,000 ISA allowance. While this was a key campaign issue for some in the fi…