According to a new analysis, homeowners face a £23,000 rise in interest payments after rates hit a 15-year high.The average interest rate for a five-year fixed-term mortgage now sits at 5.83%, up from 5.17% since the start of June, Moneyfacts data shows.According to an analysis by property lending experts Octane Capital, it means the average homebuyer looking for new five-year fixed mortgage...