In reply to Fluvial:
Wood stoves are brilliant, but...
If you are doing it to save money on heating, you will not. Wood burning stoves are more of a lifestyle thing - which needs to include enjoyment of chopping/splitting/stacking logs and keeping them for 2 years to dry. (or paying someone else to). Logs are more expensive than gas or oil, and still demand hard work to move and store them even if you buy them.
The flue height will be dependent and related to proximity to walls, windows, ridge height and is defined in the building regs. - see the planning portal.
I'd recommend a decent quality stove like Morso or Clearview.
I had a Morso (Defra approved) fitted last year at a cost of £2500 for stove, liner, cowl, register plate, vermiculite insulation, lintel, installation, and HETAS cert and C0 alarm. This did not include modifying chimney chamber, new concrete hearth, plastering.
In a very small stove I burn about a wheelbarrow of logs in a day. One log 14" long x 6" diameter burn through in about 40-60mins. So you need to bank on having a large covered wood store.
Also you could end up spending on chainsaws, axes, protective gear, chains/oil/petrol, trailer for collecting logs etc.