Mates series 1 been stood a good 6 months finally get things sorted and off for MOT, then for tax puts it in reverse all is fine. Now try to get it out of reverse and its stuck in

The gearlever doesnt move apart from play, it isnt in anygear as the car will start with clutch out but lever will not budge. He dropped the gearlever out of car and had a mess with linkage to no avail ? is box dead or summat easy we can try ?