You can sell but ensure your IP removes any restriction against the property. Do it quickly though as if there is a shortfall after the sale it could be included within the IVA.
And that would cause extreme difficulties for your IP and potentially yourself, if there were to be a shortfall included in the IVA - as presumably all funds have now been distributed? You would find that you would have to pay more money into the IVA to deal with that debt.
Is selling the right solution, or could you try and negotiate a reduction in mortgage payments with the lender? Is your mortgage interest only, or repayment?