Mortgage protection policies do have a bad reputation for paying out. You should consult your particular policy documant for details of the cover that you have as they are all different. My guess is that, if you will be made redundant, they will cover you as long as you didn't expect this to happen when you took the policy out.
The government will pay the interest on a mortgage after a few weeks of unemployment. You should also investigate working tax credits if you will be working. My opinion is that it is better looking to these government policies rather than an insurance company's.
The last option for anyone in your situation is to head overseas.