Bleeding with T4 gives the system a complete bleed purging any air within the system.
The factory were using this method for other models R8/concerto/200/400 25/45 years ago albeit not a T4 but a purging tool all the same,
Haynes manual sorry don't regard their advice as anything but a guide for general diy jobs.
This bleed function is not unique to Mg/rover as other manufacturers require it too with their dealer diagnostic equipment too
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