Bird strike
That may have been me (from Chivenor). A mallard duck came through the windscreen (not the cannopy) and totally blinded me. It also surged the engine, but I later relit it. I landed blind at Wittering. The nav in the back could not fly the Hawk, but made the RT calls as I could not (my face was rather rearranged). Subsequently, the front windscreens of Hawks were redesigned