I would say it depends on the level of cover.
For example if you have an accident that leaves you able bodied but mentally deficient the insurance might be useless.
If it is your main source of income you may be better to look at a PHI policy, however they do not normally come cheap.
They will offer a deferral period and will pay out for a set period of time eg. until your 65th birthday. They can also be index linked so if you can never return to work it will increase each year. Many of these policies will also pay for private medical assistance eg. physiotherapy, on the basis that if you get healed and go back to work they will save money long term.
You need to make sure it is appropriate to your situation though as some policies will have an "any occupation" clause and some an "own occupation" clause. The difference being one will only cover you if you cannot work at all, not if you cannot do your current occupation.
I would contact a financial adviser and they can help you find the right policy just be careful who you choose to use, if you decide this is something you do want to do and want some further pointers give me a shout.
