Can you spin the wheels in the dry?
Guess it's back to the dealer to be investigated unless you guys have any suggestions?
Decided there was definately a fault with the trans so booked it in for MB to investigate. Took the service manager for a test drive and he agreed also that it was not right. MB had the car for 3 days, ordered a new torque converter etc etc and the cars now back FIXED and going like new
Basically for those interested it appears that something was out of alignment on the transmission and coupled with low oil in the box was causing it to be starved of oil on hard acceleration and the hydrolic's were failing.



