My Dad worked for a large proportion of them - first BTH, then AEI (taken over), then GEC (taken over), then GEC-Elliott Automation, then Monsanto (bought Elliott Automation). He then retired and GEC rebought (some of) Elliott Automation back (some of those bought back didn't feel their pensions had been looked after in all the moves). My Dad was always very pleased he retired from Monsanto (in spite if their poor press) as they did see him right pension wise.