Where a house is converted into two flats and the leaseholders commenced collective enfranchisement under the Leasehold Reform, Housing and Urban Development Act 1993, reached the stage of agreeing terms and premium and intended to complete shortly, but one of the leaseholders (who had been acting via their power of attorney) has now died, is it possible to still complete the enfranchisement given that the statutory deadline is approaching, and if so what is the procedure for this?