Steering Wheel Removal and Replacement ??

[Plushy]

Hi Guys ,
I am trying to remove my old steering wheel from the steering column and i am having a lot of trouble working out the best way to remove it , the steering wheel is stuffed and the horn part in the middle is gone and the centre is a mass of rust .
Can any one suggest a method of removal ? and does anyone know where i can get a replacement steering wheel from ?

cheers Plushy