Hi Kit Kat
My suggestion is to use your Mum's £4k to supplement the shortfall in IVA payments - at the rate of £155 per month this will last for two years, over which time I am sure that your finances will have improved. As soon as you can consolidate your existing mortgage and secured loan into one mortgage account, then I would look at this as a further way of saving money. You can then go interest only until the end of the IVA, at which time you will be able to make up any capital repayment loss from the savings you are making in not funding an IVA.
In your case, I feel it is all about careful ongoing cash management.
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