Hi lucy and welcome to the forum.
Your disposable income is a little low for an IVA, so if you are only able to pay £450 per month (you would need about £560 to provide the minimum dividend required by an IVA) the you ought to look at either a debt management programme, which would take many years to pay off or bankruptcy proceedings. Bankruptcy proceedings will cost approximately £1,000 to make your Court applications.
If you were prepared to surrender your endowment policy in an IVA, then you could propose one based upon the lower contribution. This would also be lost under the bankruptcy proceedings, and you would not need to change your mortgage. And if you were going to surrender the endowment policy, this would probably increase your disposable income as you would not be paying the monthly instalments to the policy any longer - making the IVA even more attractive for creditors.
Under bankruptcy proceedings, as there is no equity in your property, you could arrange for a family member to buy out your interest for a nominal sum (usually £1) but you may be required to make monthly contributions under an Income Payments Order for three years - based upon your disposable income.
Lots to think about, but let us know what you decide.
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