Sarah
Your IP should have told you that is nigh impossible to avoid the equity release provision. Fair enough to you if it is not for you, but a lot of everyone's time could have been saved here. This modification is unlikely to be negotiated out.
You will only need to remortgage to 85% loan to value, but of course this does gamble on the propoerty market. Where do your creditors feel that you are overspending to warrant an increase of £150 per month. That does seem a very high jump.
Is your IP experienced in proposing IVAs? Bankruptcy is now probably a better option for you given that you have no equity in your property and that you are prioritising the needs of your children. 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