Abstract: A plastic formwork is disclosed, and comprises a slurry-receiving structure, wherein the slurry-receiving structure defines an aperture and a formwork-defined internal space, wherein a slurry is receivable within the formwork-defined internal space. The formwork further comprises a formwork-defined first connection system counterpart and a formwork-defined second connection system counterpart, each of which includes a sealed interface-effecting portion that is supported by a substrate portion. The material of the sealed interface-effecting portion is softer than the material of the substrate portion. The formwork is connectible to another formwork via interlocking engagement with effect that an obtained aperture and an obtained internal space are obtained, wherein a slurry is receivable within the obtained internal space.

Abstract: There is provided a kit of parts configurable for assembly within a window assembly, that defines a window opening, and includes a frame and a sash, wherein the sash is slidably mounted relative to the frame for slidable movement relative to the frame from a first position to a second position, wherein the kit comprises a frame member of the above-described frame, a sash member of the above-described sash; wherein: the frame member defines a retainer; and the frame, the retainer, and the sash are co-operatively configured such that, while the sash is disposed relative to the frame in the first position, the retainer is interfering with movement of the sash member in an inwardly direction, and while the sash is disposed relative to the frame in the second position, there is an absence of interference to movement of the sash member in the inwardly direction. There is also provided a window construction obtainable from assembly of at least the parts of the kit of parts.

Abstract: A plastic formwork is disclosed, and comprises a slurry-receiving structure, wherein the slurry-receiving structure defines an aperture and a formwork-defined internal space, wherein a slurry is receivable within the formwork-defined internal space. The formwork further comprises a formwork-defined first connection system counterpart and a formwork-defined second connection system counterpart, each of which includes a sealed interface-effecting portion that is supported by a substrate portion. The material of the sealed interface-effecting portion is softer than the material of the substrate portion. The formwork is connectible to another formwork via interlocking engagement with effect that an obtained aperture and an obtained internal space are obtained, wherein a slurry is receivable within the obtained internal space.