We have a mortgage with Nationwide, we had a 2 year deal which will soon be coming to an end. We would like to move to a new deal before we jump to variable rate which will see our mortgage cost increase by £200ish a month! So my question is, if we switch to a new mortgage product with our current provider do we have to go through a new application, proving income/outgoings/payslips etc again? It's a faff! Buy would like to get myself in order before we switch. Thanks.