That was arguably a flaw in BA's training procedures
In the simulators at that point BA always used the callsign Speedbird 95. Not sure why, maybe it didn't conflict with any of their actual callsigns. Whatever the reason, it meant that whenever the pilots trained for emergency situations, they were always using the same callsign.
Unfortunately, this meant that when the crew reverted to their learned procedures, they also unwittingly reverted to the callsign they were using in the sim. BA revised their training procedures as soon as this came to light.
The full AAIB report is worth a read:
www.aaib.gov.uk/cms_resources.cfm?file=/1-2010%20G-YMMM.pdf
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wheresthefish Partly filled with wrong, Tue 17 Jul 2012, 22:50,
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