From my research , certainly with the RAF anyway, the main reason is stated as being because P is a stress related disorder and the job is/can be stressfull they will not knowingly employ someone who will/may take time off due to and existing illness..
Personally I think thats a load of two little round things that guys have.
I do not believe that my P is stress related. 22 years continueous I've had it.. You're not telling me that I've been stressed since I was six..
I've had stressfull jobs, and stressfull times in my life, my P has never gotten worse.. I think its been wrongly classed in the medical journals..
Michael, thanks for that address, if the fire service fail me because of it I'll certainly give then a call.. the RAF was about 10 years ago, it may of changed now.