I guess the screws that hold that inner panel in place might need to be drilled out if they very corroded. One of the first jobs I did on mine when I got it was to replace them with stainless steel ones. Using mild steel screws in a location like this where they are guaranteed to get a regular soaking is very poor practice. Probably a 30p saving per car for MMC though. Once the inner panel is removed then I believe the stalks can be easily unbolted.
