In my experience in the recent market (in a HCOL city in the U.K.) rent is only marginally less than the interest on the equivalent mortgage. All the cost calc

In my experience in the recent market (in a HCOL city in the U.K.) rent is only marginally less than the interest on the equivalent mortgage. All the cost calculations should be based off interest only. The principle repayment is a cashflow issue - and a signifcant one at that.