Hi Steve & John
Thanks for your replies but not sure what these abreviations mean. The car has since been into my local MB dealer and had the shifter unit replaced but still has same problem. It's sticks in park about every other time I start the car - everytime this happens, I just wait, maybe a couple of minutes and miraculously I can then take it out of park fine.

They are still telling me that there are no fault codes recorded. They now want to change the ignition switch which is ordered.

Does this help you any? Would appreciate some explanations of the terminology you are using, although I'm mechanically competant I'm not familiar with the electronic terms used.

Thanks very much, your knowledge and assitance is appreciated.
Jace