I'm afraid if you read the small print of your mortgage conditions it will probably contain a provision declaring that the mortgage debt becomes immediately repayable in circumstances where the borrower enters into any arrangement with their creditors, including an IVA.
This provision is pretty standard in most commercial and residential mortgage contracts. The difference with a commercial contract is that it is not regulated by the FSA so lenders feel they can act according to the terms of your contract, whereas with a regulated mortgage contract the lender is less likely to invoke this provision (although it is not unheard of) as FOS and the FSA are likely to get involved if a complaint is made.
I would agree that you need to seek legal advice, but be prepared for the solicitor to advise you that; according to the terms of the contract you will not have a leg to stand on.
Your best option is to stand firm, continue to make your commercial mortgage payments and see if you are able to remortgage away from your existing lender, to one which will allow the IVA to be in place.
If your current lender starts repossession proceedings, apply to your local court for an emergency hearing (costs around £70.00) and ask the court to suspend the repossession until you are able to remortgage.
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