At the end of each heating season, as well as having your chimney swept, your stove should undergo an annual service which will include stripping, inspecting and cleaning the appliance. This should be carried out for you by a HETAS registered engineer.
Coles For Fires is a registered member of HETAS (Heating Equipment Testing and Approvals Scheme). They are the only specialist organisation approving biomass and solid fuel heating appliances, fuels and services. This also includes the registration of competent installers and servicing businesses.
It is generally a condition of your stove warranty that the appliance is serviced annually. You may also want to check the terms of your home insurance, this can be especially true if you have a home of non-standard construction, such as timber framed or thatched roof.