A good one for a small room is the Morso Squirrel. I used the following to install both of my log burners:
http: //www.coalwoodheatingcentre.co.uk/ in Cheadle who have been around for a long time.
The place in New Mills is also good. Some of the newer operations are not very good and cut corners.
You also need a good sweep to clean the flues every year, e.g. Pomroy are very good at:
http: //www.pomroy-chimneysweep.co.uk/
With a flue liner you need to be careful what you burn as smokeless fuel will destroy the liner much quicker than well seasoned wood.