Hi clairl and welcome to the forum
You are barely insolvent, but I imagine with a prudent house valuation your equity would probably reduce from the £40,000 you have quoted.
How much did CCCS say you have to pay per month, compared to what you think you can pay? If you send over that information I can advise further.
An IVA will ultimately effect your credit rating, but not to the extent that you will be unable to mortgage again in the future.
The most important thing to prioritise now is keeping those unsecured creditors under control - especially given the equity in your property which is up for grabs if they start proceeding with Charging Orders.
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