Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1059 Post(s)
Judging from the description you must be in England?
Those engines were never sold in USA, where most of the members are from.
Not knowing your car, I can have general guess that your battery is getting weak. When voltage drops below certain mark, the computer will not engage the starter and on some models will disable comfort items to save the energy.
Other might be bad neutral switch on the transmission, or bad clutch switch if you have manual.
Welcome to the forum.