Wait until you get offered the new job. Then compute what your net take home pay will be, then re-do your day to day living expenditure taking into account new clothes, travelling, lunches etc. Also indicate monies needed to stock up for baby things - then ask your IP (not his underling) to advise what extra you will have to contribute into your IVA. If that is reasonable then go ahead with it. If unreasonable and you have good cogent reasons you could ask your IP to circularise your creditors and ask their views. Good luck and congratulations on the good news.
Regards, David Mond, Insolvency Practitioner for over 46 years. Personal Insolvency Practitioner of the year 2012, Personal Insolvency Practitioner of the year finalist 2013 & 2014 awarded by Insolvency & Rescue Magazine and 2015 finalist for Personal Insolvency Firm of the Year.