Well, all I can say that three independent fleet listings - that tend to be rather reliable - report ten aircraft with BA Cityflyer. If this inaccurate, I wold be interested to hear what aircraft other than those that have been with Swiss for quite some time now have left the fleet and where they currently are.
This, by the way, is an ad placed by BA Cityflyer last Tuesday:
BA CityFlyer
OPERATIONS AND MAINTENANCE CONTROLLERS placed on: 03/04/2007
...
This is an exciting opportunity to join the operations team at BA CityFlyer working to deliver undisputable operational excellence. BA CityFlyer is a new subsidiary of BA Plc and will operate a fleet of 10 RJ100 aircraft out of London City Airport flying to domestic and European destinations....