Offset mortgage vs savings
An offset mortgage is where you have savings and a mortgage with the same lender and your cash savings are used to reduce - or 'offset' - the amount of mortgage interest you're charged.
Instead of a standard savings account, you could place your savings in an offset account linked to your mortgage. This means you won't pay interest on the mortgage debt of the equivalent amount of the savings. Use this calculator to work out if an offset mortgage works out better for you.