Hi Lesley and welcome to the forum
Once you have committed to an IVA, I am afraid that your credit rating will reflect this for si years following the date of the creditors meeting, even if you settle early, so this is going to show up on your husband's credit report. It might be better if he discusses the implications of this with his line manager, assuming that he is intending on staying with the same company.
As your IVA provider has recently changed, it may be sensible to arrange a meeting with the new IP so that you can understand how they intend to supervise your IVA into the future, but it will definately be in accordance with the terms of the original proposal.
Regards, Melanie Giles, Insolvency Practitioner