As your employer has gone into Administration, there will not be very much severance pay I imagine, depending upon the length of time you have worked there. Also this will take approximately two months for the Department of Employment to pay out.
Your priority at this time is to find alternative employment - and perhaps your wife also ought to look as well. This is needed to put food on the table, and keep a roof over your heads, which are higher priorities than funding your IVA.
At the same time as Andy says do make your IP aware of the situation, and ask for a short payment holiday until you decide what you are going to do. With a bit of luck the Administrators may sell the company, so there may be employment possibilities for you there at the end of the day.
Good luck.
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