A surgical robotic drape for enveloping a surgical robotic arm includes a covering for enveloping the robotic arm to define a sterile boundary thereover; an interface element attached to the covering, the interface element being configured to engage a drive assembly interface and an instrument interface to couple the drive assembly to an instrument to thereby provide drive to the instrument through the drape; and a guiding structure attached to the covering for locating the interface element relative to the drive assembly interface. The guiding structure is deformable between a storage configuration for when the drape is to be stored, and an operative configuration in which the guiding structure is configured to attach to the robotic arm to position the interface element with respect to the interface of the drive assembly for engagement therewith.