but there will be TUPE involved as many of the Aviance staff went to Menzies with the BMI handling contract.
maybe, but not in the way you state. they have the terms and conditions of an aviance contract but they now work for Menzies not Aviance.
If BMi is closed down as seems likley then the work would cease to exisit and therefore there would be no TUPE. Once again a good union rep will be essential to convincing everyone that the work still exisits and therefore TUPE would apply.