Hi Gerrard and welcome to the forum
Creditors can potentially force you into bankruptcy by petitioning, however they rarely do as this is seen as throwing good money after bad. They would probably rather pursue you directly than this to be frank.
If the IVA fails you are really back to the starting blocks with one option removed. Then you could declare yourselves bankrupt, enter into a DMP, or do nothing - but the latter will just bring more and more creditor pressure, potential charging orders and general upleasantness. How much do you owe to creditors and what is the value of the equity in your property?
And do remember that over 80% of all IVA proposals put in front of creditors actually are accepted.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp