Hopefully you are now aware that what you proposed to do in your first
post is off target, and quite likely even criminal.

These are the folks that will help most:
http://www.periodproperty.co.uk/cgi-...sing/forum2.pl
There's also SPAB.

What you do to the building, down to almost every last detail, is
dictated by an official, and this includes what colour (or what shade
of white) you paint the windows. I'm not kidding. If the house
contains pictures these may also be covered by the listing, and
selling one could put you in jail. Also the curtilage of the building
will also normally be covered by the listing. It is essential you
understand what youre dealing with, what listing actually means.

A 3" bend is unlikely to be any cause to do anything, though I couldnt
possibly guarantee that to be the case. However any work you do will
be required to be an exact restoration of the original in every
respect, including use of the same type of wood and so on, so none of
your earlier repair ideas are likely to be legal.

What will you do with the house? If you plan to sell, repairs of the
things you mention would make no sense financially. A grade 2 listed
building is a different thing to a terraced house, where a quick tart
up pays. In most cases you won't see an increase in value that would
pay for any work you do.

Re surveyors, I would have a good long chat on period property forum
before engaging one, or in fact doing anything at all.

g'luck


NT