Hi coben and welcome to the forum
I do not understand why the mortgage has been effected and you are still holding the money. Is your IP aware of this - presumably so if it was done with his assistance! Bizarre!
And why have you raised money if there was no provision for this in the IVA? Even stranger!
The danger of not paying it over (if indeed you are actually required to do so) is that you are likely to fritter it away and end up in a pickle. Come clean with your Supervisor and take his advice soonest.
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