Hi roger g and welcome to the forum
If you were unable to continue making your IVA payments as a result of the loss or retirement from a job, then it is possible to alter the terms of the arrangement to accomodate this - perhaps by offering a lump sum from your redundancy package or pension.
If this happens to you, discuss matters with your IP as soon as you are put on notice by your employer, so that a plan of action can be agreed at an early stage. I have done this many times quite successfully in practice.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk