Exactly as Liam says above- my last mortgage bank managed to lose my original policy document, which mean requesting a replacement from the life assurer and a 6 week delay in switching as I couldn’t put the life cover in place with the new mortgage bank. Health has changed quite a bit since we took out the original policy so buying a brand new policy would more than negate the savings from the switch as well as requiring medicals etc. I’d highly recommend to movers/switchers that they keep their existing mortgage protection policies - life cover gets a lot more expensive as you get older and/or experience any health issues.