By Sophie Huskisson Rishi Sunak is considering a radical plan to allow first-time buyers to take out a mortgage with a 1% deposit. In a bid to appeal to young voters, the PM and Chancellor Jeremy Hunt are considering a mortgage guarantee scheme to help people get onto the property ladder. It would mean someone buying a house at the average UK house price of £288,000 would need to put down a deposit of £2,880. But experts warn a shortage of housing means the scheme could end up driving the cost of new homes. Currently the mortgage guarantee scheme allows first-time buyers to take out a mortgage…