A safety screen for a climbing screen system, the safety screen comprising: at least one fixed panel comprising at least one horizontal frame member (6, 106), the horizontal frame member (6, 106) comprising: a mounting plate (10, 110) securable to a screen support member in use; a frame plate (11, 111) spaced from the mounting plate (10, 110); and a base plate (12, 112) extending between the mounting plate (10, 110) and frame plate (11, 111), wherein the mounting plate (10, 110), the base plate (12, 112) and frame plate (11, 111) together define a channel for slidably receiving a movable panel therein, characterised by further comprising: at least one bearing plate (15, 115, 130) provided on the mounting plate (10, 110) and/or the frame plate (11, 111) and facing towards the channel, to provide a bearing surface for the movable panel; and, a bearing return plate (16, 116, 131) extending between the bearing plate (15, 115, 130) and the respective mounting plate (10, 110) and/or frame plate (11, 111), to space the bearing plate (15, 115, 130) from the respective mounting plate (10, 110) and/or frame plate (11, 111), wherein the bearing plate (15, 115, 130) is substantially parallel to the respective mounting (10, 110) plate and/or frame plate (11, 111). at least one fixed panel comprising at least one horizontal frame member (6, 106), the horizontal frame member (6, 106) comprising: a mounting plate (10, 110) securable to a screen support member in use; a frame plate (11, 111) spaced from the mounting plate (10, 110); and a base plate (12, 112) extending between the mounting plate (10, 110) and frame plate (11, 111), wherein the mounting plate (10, 110), the base plate (12, 112) and frame plate (11, 111) together define a channel for slidably receiving a movable panel therein, a mounting plate (10, 110) securable to a screen support member in use; a frame plate (11, 111) spaced from the mounting plate (10, 110); and a base plate (12, 112) extending between the mounting plate (10, 110) and frame plate (11, 111), wherein the mounting plate (10, 110), the base plate (12, 112) and frame plate (11, 111) together define a channel for slidably receiving a movable panel therein, characterised by further comprising: at least one bearing plate (15, 115, 130) provided on the mounting plate (10, 110) and/or the frame plate (11, 111) and facing towards the channel, to provide a bearing surface for the movable panel; and, a bearing return plate (16, 116, 131) extending between the bearing plate (15, 115, 130) and the respective mounting plate (10, 110) and/or frame plate (11, 111), to space the bearing plate (15, 115, 130) from the respective mounting plate (10, 110) and/or frame plate (11, 111), wherein the bearing plate (15, 115, 130) is substantially parallel to the respective mounting (10, 110) plate and/or frame plate (11, 111). at least one bearing plate (15, 115, 130) provided on the mounting plate (10, 110) and/or the frame plate (11, 111) and facing towards the channel, to provide a bearing surface for the movable panel; and, a bearing return plate (16, 116, 131) extending between the bearing plate (15, 115, 130) and the respective mounting plate (10, 110) and/or frame plate (11, 111), to space the bearing plate (15, 115, 130) from the respective mounting plate (10, 110) and/or frame plate (11, 111), wherein the bearing plate (15, 115, 130) is substantially parallel to the respective mounting (10, 110) plate and/or frame plate (11, 111).