Mmmmm---- a few points here
a) we aren't a crumbling wreck-- my OH spends his life repairing and maintaining our building. The listing is due mainly to the age of the building, but we also have an important historical link to a famous Llandudno person.
b) when we bought the place the cost of heritage windows was beyond what we could pay, having had to replace the roof, drainage system, rewire and other major jobs just to stay open !
c) Jobs like window replacement cannot be carried out whilst a business is open.
d) Now we are both of retirement age, such a job would not be undertaken lightly, common sense prevails and since my OH fitted proper window catches and other draught products we keep warm enough.
e) Our part of the house and the garage have just had brand new roofs fitted ( by an excellent firm) so at least we are safe and dry.
f) Listed buildings cannot have any internal alterations without permission. Thus no knocking walls down inside to make rooms bigger !!!