A steering column assembly having an adjustable shroud comprises a fixed portion arranged to be secured to a body of a vehicle and a moving portion which can be moved telescopically relative to the fixed portion, a clamp mechanism which releasably fixes the moving portion in position relative the vehicle body, the clamp mechanism being movable between a first, unclamped, position in which the fixed portion and the moving portion can move relative to one another and a second, clamped, position in which the fixed portion and the moving portion are prevented from relative movement, and a lock mechanism, wherein the assembly is so arranged that when the clamp mechanism is in the first position the lock mechanism limits a range of movement of the moving portion relative to the fixed portion at least in a collapse direction by providing a path for collapse forces from the moving portion through the lock mechanism to the fixed portion, and when the clamp mechanism is in the second position the lock mechanism permits additional telescopic movement of the moving portion towards the fixed portion beyond the limited range of movement by removing the force path.