Good morning mynewt,
Well as circumstances in your life changes so will your perspective so remain flexable and price up cover carefully price comparison sites such as this one will give you a general figure, however depending on what exactly is required for each insurance you may have to 'tweek' it a bit! Loyalty doesn't pay review any policies regularly.
Mortgage will require insurance for the building not contents so you may consider contents insurance not a legal requirement but unless you can afford to replace all your contents a good idea. You say you have no children yet the question you need to ask is if you require life insurance yet to pay out to your NOK and dependents (your children) if something was to happen to you.
Pet Insurance oh the list goes on! Have a talk and decide what are the important things in life and what could cause you difficulty if something was to happen then decide. The only thing I would strongly advise is that if you are in a position too seek Independent Financial advice (IFA)
Regards,
Paul