To be on the safe side, take the IELTS. No harm done when you take it. It will save you any troubles. What's £145 compared to the troubles it will cause you if your visa won't be approved or be put on hold. Trust me, it's worth paying for a new test than using the test that you already know is not valid. I believe one member here has her ILR put on hold because of TOEIC.

http://filipinaroses.com/showthread.php/53001-Am-Robbed!