Hi usy and welcome to the forum
Assuming that the limited company is trading successfully, and their is no hint of your personal guarantees being called upon, you are not technically insolvent - although you are having cashflow difficulties. In which case I do not feel an IVA is necessary.
If you can afford to take on higher mortgage borrowings, I suggest you look at a 90% loan to value deal now, which ought to raise you £45k now after costs. You will be a little short of paying the debts off in full, but could possibly manage the reduced payments.
Mortgages are still the cheapest way of borrowing, but do be sure to cut up those credit cards and not rely on this type of credit in the future.
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