The message
from Dave Fawthrop contains these words:

Go to your local library and look at old maps.
| My Son in Law dated his house to a year, but he was lucky.
|
|I tried that years ago. The copy Keighley Library has of the first 6"
|survey is a completely illegible photocopy. The librarian was unable to
|suggest any earlier maps.

Have you tried Bradford Central Library?

I thought about it (I have been there a time or two to consult the law
library) but I since found an image on oldmaps.co.uk that was just as
bad so I assume a good copy of the 6" no longer exists. Incidentally I
tried looking for oldmaps.co.uk earlier today but couldn't gain access
and the link from the OS site seems to have disappeared.

Keighley is part of Bradford, officially.

Only when they want money. :-(

--
Roger Chapman