"showed a pass rate for 72 per cent for the tests that had been run".
Personally if I issued a release for UAT and it had a 28% failure rate I would expect two things: 1, Massive personal embarrassment 2, The users ending the UAT early due to it "not working". To me that smacks of the devs not doing their own testing and just chucking it over the fence, either due to too much pressure from IBM or laziness.