....They have a part that screws into a wall and the bit left sticking out then twists perpendicular to the main direction of the screw, this enables you to put the straight bit through a hole and twist to hold it or un twist to remove it. I need some but I have no idea what to search for. Thanks.
Those toggle anchors are big heavy duty things used for construction, not picture hanging.
Search for 50x Brass Dresser Hooks - Small 13mm L Square Shoulder Screw Key Wall Hangers on Amazon. They don't toggle but should do the job
barry, yes but that's the sort of thing. I have seen them much smaller just can't seem to find them though but "Toggle anchor" is the name to search for so I'm looking round.