None !!
You might think a wise person would take out such protection, but when I last looked at such products on the market – it worked out that with 20% of the policy holders claiming on their policy, the insurance company would still be quids in.
Most have a very limited pay-out period of 12 months, and will not pay out until you have been unemployed for 3 months. Most also have a qualifying period, during which you are giving the insurance company money for nothing.
Many people, such as myself, work for large outfits which would only make staff compulsorily redundant should the whole company go down the tubes. Otherwise they may offer voluntary redundancy (with a handsome payoff) – but no mortgage protection policy will pay out for voluntary redundancy.
Read the small print of any policy before signing up and handing over money on a monthly basis.