OK - so you have debts of actually more like £18k and will be paying in £23k. That is no so bad, but still means that you are paying your debts largely in full. What was the proposed dividend quoted to your creditors?
If you feel that the IVA is no longer the right solution for you, due to affordability, you could ask your IP to seek a reduction of payments via a variation meeting, or simply default on your IVA payments forcing your IP to close your case. Be careful, however, that this does not lead to bankruptcy proceedings being taken against you.
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
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http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp