While the corrective action relative to the oil fire (faulty pipe manufacture, etc.) is entirely appropriate, I hope that R-R doesn't stop there.
The fact that the T900 engine cannot survive a IP shaft disconnect is really disturbing to the turbomachinery folks I see often. I give you the RB211/744 failure
QF74, 31 Aug 2010, KSFO - the shaft broke, the IPT oversped, but it shed its blades before reaching burst speed. An uncontained failure (escaped turbine blade fragments), but with considerably less airframe damage.