Stovax Gas Stove .. Line or not to Line

[DAPLUME]

Recently purchased a house that has a a huntingdon 30 gas stove in a chimney breast but not fitted . I have read the instructions which says it has to have a liner .. One fitter has said it shouldn't need one obviously i like the sound of that as it will save me £700.00+ but obviously i want to do whats right.

The house is a late 30,s built semi the chimney has been swept and smoke tested .. all ok ...

Any thoughts really appreciated