Semi-neglected GEC Europa 65w fluorescent fittings

These 2 fittings and a handful more are to be found recessed around the walls outside a lecture theatre on my university's campus. They are very neglected, some are very rusted, many contain no tubes and those that do have a mishmash of T8s, mercury starved tubed and EOL T12s... A shame, because these Europas are the early versions with grey-painted endcaps. Also, note the odd E27 lampholder next to the left fitting. I think that is the remnants of a low voltage emergency lighting system.