A liquid fuel burner comprising: - a liquid fuel container which includes a container body having a fuel discharge port, and a valve assembly mounted to the fuel discharge port, said valve assembly including a valve seat structure having a valve seat, a valve element including a valve member co-operable with the valve seat, and an energizing element to generate a pressing force to press the valve member against the valve seat; - a liquid fuel tank having a fuel feed port; - an attachment mounted to the fuel feed port, said attachment including a recessed portion to receive the valve seat structure and an actuating pin disposed inside the recessed portion and configured to push up the valve element when the valve seat structure is received in the recessed portion, said recessed portion having fuel discharge holes to allow a liquid fuel which is discharged from the liquid fuel container into the recessed portion to pass through the fuel discharge holes into the liquid fuel tank; and - a burner assembly operable to burn liquid fuel fed from the liquid fuel tank; characterised in that: the attachment includes a plurality of latch projections (34; 41) arranged in a circumferential direction to project inwardly of the recessed portion, each of the latch projections being associated with a resilient element (33; 40) against which each latch projection is moved in an outward direction by the valve assembly when the valve assembly enters the recessed portion; and the valve assembly includes a circumferentially extending latching feature which is engaged by the latch projections when the valve assembly is within the recessed portion and the actuating pin acts to push up the valve element, said engagement between the latch projections (34; 41) and the circumferentially extending latching feature being operable to overcome the pressing force of the energizing element and hold the valve assembly within the recessed portion. - a liquid fuel container which includes a container body having a fuel discharge port, and a valve assembly mounted to the fuel discharge port, said valve assembly including a valve seat structure having a valve seat, a valve element including a valve member co-operable with the valve seat, and an energizing element to generate a pressing force to press the valve member against the valve seat; - a liquid fuel tank having a fuel feed port; - an attachment mounted to the fuel feed port, said attachment including a recessed portion to receive the valve seat structure and an actuating pin disposed inside the recessed portion and configured to push up the valve element when the valve seat structure is received in the recessed portion, said recessed portion having fuel discharge holes to allow a liquid fuel which is discharged from the liquid fuel container into the recessed portion to pass through the fuel discharge holes into the liquid fuel tank; and - a burner assembly operable to burn liquid fuel fed from the liquid fuel tank; the attachment includes a plurality of latch projections (34; 41) arranged in a circumferential direction to project inwardly of the recessed portion, each of the latch projections being associated with a resilient element (33; 40) against which each latch projection is moved in an outward direction by the valve assembly when the valve assembly enters the recessed portion; and the valve assembly includes a circumferentially extending latching feature which is engaged by the latch projections when the valve assembly is within the recessed portion and the actuating pin acts to push up the valve element, said engagement between the latch projections (34; 41) and the circumferentially extending latching feature being operable to overcome the pressing force of the energizing element and hold the valve assembly within the recessed portion.