Lynchy,
Further to Ians advice, I would suggest you cover more than just the mortgage amount. If the worst was to happen, yes you have the knowledge that the mortgage is paid off, but you will now lose the income of the deceased, therefore affecting the standard of living of the remaining partner. Obviously depending on your earnings, I would suggest getting an extra £200,000 of cover (invested would provide a monthly income of about £1000).
Would also suggest (if affordability is not an issue) that you change your mortgage to a maximum of 25 years - £82,500 over 35 years at 6% will cost £470 a month, total interest £115,000. Changing to 25 years only costs an extra £60 a month but will save £38,000 in interest over the term - thats a couple of brand new cars you are saving!!!!
Regards,
Adey