There are many excellent resources on looking after traditional buildings, many freely available on the internet.
The Society for the Protection of Ancient Buildings produces various pamphlets and guides and has an excellent Q & A section on it website.
English Heritage has a wealth of information on all things conservation and heritage related. In particular it has advice on looking after old properties.
Projectbook also has range of articles relating to traditional buildings.
How to look after your period property
An excellent resource containing many articles and a directory of companies, services, and training courses relatiing to building conservation Buidling Conservation Directory