A blind for a building opening, and having a head rail, attachable adjacent the building opening, said head rail defining upper and lower regions, and comprising: an upper blind roller, located in said upper region of said head rail, a lower blind attachment located in said lower region of said head rail, an upper blind stored on said upper blind roller, a lower blind stored on said lower blind attachment, upper blind control mechanism operable to lower and raise said upper blind, lower blind control mechanism operable to operate said lower blind wherein said upper blind roller is located with an upper axis along an upper plane in said head rail and said lower blind attachment is located on a lower axis along a lower plane within said head rail, said axes being displaced vertically from one another, and wherein said upper blind is operable to depend down beside a predetermined side of said lower blind attachment, and wherein said lower blind is operable to depend down alongside but spaced from said upper blind, to provide a head rail having a slim, aesthetically pleasing profile, wherein said upper and lower control mechanisms (62, 64) include blind panel control elements (36, 34) for each of said blinds (18, 16) whereby the same can be stored in the head rail, characterized in that said upper blind is an opaque black out blind, and said lower blind is a semi translucent blind, whereby when said upper blind is raised and said lower blind is deployed, some light will pass in, and wherein when said upper blind is lowered light is substantially excluded, and in that the blind further includes blind control guide ribs (70,72,74) for guiding said control elements (36,34) and locating said control elements (36,34) forward of the edges of said upper and lower blinds (16, 18). an upper blind roller, located in said upper region of said head rail, a lower blind attachment located in said lower region of said head rail, an upper blind stored on said upper blind roller, a lower blind stored on said lower blind attachment, upper blind control mechanism operable to lower and raise said upper blind, lower blind control mechanism operable to operate said lower blind wherein said upper blind roller is located with an upper axis along an upper plane in said head rail and said lower blind attachment is located on a lower axis along a lower plane within said head rail, said axes being displaced vertically from one another, and wherein said upper blind is operable to depend down beside a predetermined side of said lower blind attachment, and wherein said lower blind is operable to depend down alongside but spaced from said upper blind, to provide a head rail having a slim, aesthetically pleasing profile, wherein said upper and lower control mechanisms (62, 64) include blind panel control elements (36, 34) for each of said blinds (18, 16) whereby the same can be stored in the head rail, characterized in that said upper blind is an opaque black out blind, and said lower blind is a semi translucent blind, whereby when said upper blind is raised and said lower blind is deployed, some light will pass in, and wherein when said upper blind is lowered light is substantially excluded, and in that the blind further includes blind control guide ribs (70,72,74) for guiding said control elements (36,34) and locating said control elements (36,34) forward of the edges of said upper and lower blinds (16, 18).