Make it up and see if they check? Ask local historic societies. Councils often have a library of old records for local history but it could take quite a while.

The purpose is to ensure that whatever you plan do to the building doesn't result in the loss of elements of what makes the building special (i.e. worthy of listing). If you don't know the history, you can't necessarily say what's special - which is why you are being asked to do this. Personally, I think it's a mistake to expect property owners to do this kind of research because there is the potential for conflict of interest and devising a 'history' which suits the planning application. But there you go. The relevant planning guidance is in this document:

http://www.communities.gov.uk/documents/planningandbuilding/pdf/1514132.pdf

Policy HE6.1 requires applicants to "describe the significance of the heritage asset" and I don't see how you can do this without knowing the history.

If he's down as a consultee then there's a reason for it, that being that the building is either Listed or in a Conservation Area. If it's Listed he should know the history and be telling you!

YOU don't need a detailed history of the building unless he blocks what you want to do, when he'll tell you why he's opposing your plans. YOU only need a detailed history if you think he's wrong and need the evidence to prove it.

E.g. Old building, owners wanted to replace existing s/g casements (ex-Magnet 1970's type) with d/g casements in a "traditional" pattern and replace a large d/g 'picture' window with two sliding sashes. CO opposed, claiming it would detract from historic character of 18th century building. Oiginally built as a warehouse, the previous owner had knocked out to make the window openings, totally in a couple of places, partially in others (bricking up and re-making the opening - taller or wider, as the case might be). Found the documentaty evidence in the form a letter of congratulation from the council to the previous owner on having done a good job of reclaiming an old building in danger of partial demolition.

Mind you, there's a lot of satisfaction in discovering the history of an old building - IF you've got the time to do it. Which gives a clue as to why the CO is making it seem as if it's your job.

Like I said, make your proposals and challenge his opposition. If he's a clown he'll fall back on the old stand-by "likely to detract from the historic character of the building", giving the impression that he doesn't HAVE to explain himself to you Trouble is, that's when people back down instead of insisting on a rationale.

If you do feel pushed, ask to see the original citation for the Listing. If you're in a Conservation Area, then you're going to have to make a case.

Incidentally, English Heritage tend to be a lot more laid back about energy efficiency measures than individual COs.

Knowing our Local Authority as I do, I'd say Joiner is bang on with his assertions here

Of course, finding out some of the history will likely be a very rewarding exercise for you too