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Why were you suspended?
They are quiet right to be concerned because ILE on an expired passport invalidates your right to work but the situation is easily remedied. You need to apply for s No Time Limit application with Biometrics. You would find details on how to go about making this application from the GOV.UK website
ILE and ILR have the same status but until you have citizenship or NTL, the employer is right to be concerned.
I am saying for your employer to carry out the right to work procedure, they need the evidence that you have the right. ILE on an expired passport is not accepted.