Radio transmitter under four solar panels.
Having worked on Cassini Huygens, which I presume from the comments by the Beagle team must have been an uncontrolled European spacecraft landing, I find it strange that the radio transmitter was under four solar panels that had to be correctly deployed in order before radio transmission/reception was possible.
We were always concerned about single point failures and despite the compactness of Beagle's design having 4 single point failures before the radio is operational seems unthinkable.