A stay-in-place lining for lining a structure (10, 20, 30) fabricated from concrete or other curable construction material, the stay-in-place lining comprising: a plurality of panels connectable edge-to-edge via complementary connector components (160, 190) on their longitudinal edges to define at least a portion of a perimeter of a lining; each panel comprising a first connector component on a first longitudinal edge thereof and a second connector component on a second longitudinal edge thereof, the second longitudinal connector component complementary to the first connector component; and at least one edge-to-edge connection between the first connector component of a first panel and the second connector component of a second panel, the edge-to-edge connection comprising a protrusion of the first connector component of the first panel extended into a receptacle of the second connector component of the second panel through a receptacle opening, the receptacle shaped to prevent removal of the protrusion from the receptacle and the receptacle resiliently deformed by the extension of the protrusion into the receptacle to thereby apply a restorative force to the protrusion to maintain the edge-to-edge connection; wherein the first connector component of the first panel and the second connector component of the second panel are shaped such that the edge-to-edge connection is formed therebetween by force directed to move the first and second panels together in a direction generally parallel to transverse edges of the first and second panels, the transverse edges generally orthogonal to the longitudinal edges; characterized in that the receptacle comprises a pair of walls which extend from a base of the receptacle to define an interior of the receptacle and at least one branch extending from the base of the receptacle between the walls and into the interior of the receptacle, the at least one branch located to apply force to the protrusion in a direction oriented generally away from the base of the receptacle when the edge-to-edge connection is formed; and in that the at least one branch comprises a pair of branches (202A,202B) for receiving a portion of the protrusion therebetween and the pair of branches (202A,202B) are shaped or located to be spaced relatively close to one another at locations relatively proximate to the base of the receptacle and to be spaced relatively far apart from one another at locations relatively more distal from the base of the receptacle. a plurality of panels connectable edge-to-edge via complementary connector components (160, 190) on their longitudinal edges to define at least a portion of a perimeter of a lining; each panel comprising a first connector component on a first longitudinal edge thereof and a second connector component on a second longitudinal edge thereof, the second longitudinal connector component complementary to the first connector component; and at least one edge-to-edge connection between the first connector component of a first panel and the second connector component of a second panel, the edge-to-edge connection comprising a protrusion of the first connector component of the first panel extended into a receptacle of the second connector component of the second panel through a receptacle opening, the receptacle shaped to prevent removal of the protrusion from the receptacle and the receptacle resiliently deformed by the extension of the protrusion into the receptacle to thereby apply a restorative force to the protrusion to maintain the edge-to-edge connection; wherein the first connector component of the first panel and the second connector component of the second panel are shaped such that the edge-to-edge connection is formed therebetween by force directed to move the first and second panels together in a direction generally parallel to transverse edges of the first and second panels, the transverse edges generally orthogonal to the longitudinal edges; characterized in that the receptacle comprises a pair of walls which extend from a base of the receptacle to define an interior of the receptacle and at least one branch extending from the base of the receptacle between the walls and into the interior of the receptacle, the at least one branch located to apply force to the protrusion in a direction oriented generally away from the base of the receptacle when the edge-to-edge connection is formed; and in that the at least one branch comprises a pair of branches (202A,202B) for receiving a portion of the protrusion therebetween and the pair of branches (202A,202B) are shaped or located to be spaced relatively close to one another at locations relatively proximate to the base of the receptacle and to be spaced relatively far apart from one another at locations relatively more distal from the base of the receptacle.