If I were your IP, I would have chased up Barclays via KPMG who vote for them and Capital Bank via Grant Thorton. This is just my style, and I'm not saying it is the right way, but an IP is responsible for returning monies to creditors and it is fairly easy to chase well known banks.
That said, if the two creditors have been given every opportunity to submit claims, and haven't dones so, then your IP is perfectly within their rights under insolvency legislation to exclude them from the right to recieve a dividend.
You will need to ask your IP for a settlement figure. If they are happy to exclude Barclays and Captial One, then you will only need to pay over enough to meet the other creditors claims in full and your IP's costs and disbursements.
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