An electrical connector for mounting to a flexible substrate and for coupling with a mating connector having a low-profile, the electrical connector comprising: a cover portion arranged to extend in a plane parallel to the flexible substrate so as to cover a mounting hole in the substrate; and a body portion comprising a connection port having electrical contacts within an end face of the port, the body portion further comprising an alignment collar arranged circumferentially around the connection port, the alignment collar being provided with an alignment feature at a discrete circumferential position for angularly aligning the mating connector with respect to the connection port, wherein the body portion is surrounded by the cover portion, wherein the connector is characterised in that: the cover portion has an access hole for alignment with the mounting hole in the substrate, the connector further comprises a backing portion arranged to extend in another plane parallel to the flexible substrate behind the cover portion, such that the substrate is sandwiched between the cover portion and the backing portion, and the body portion is integrated with the backing portion and projects through the mounting hole in the substrate and the access hole in the cover portion, wherein an outer periphery of the cover portion is cut away at diametrically opposite positions with respect to the connection port to thereby allow improved access and/or flexing of the flexible substrate in said positions when disengaging the mating connector. a cover portion arranged to extend in a plane parallel to the flexible substrate so as to cover a mounting hole in the substrate; and a body portion comprising a connection port having electrical contacts within an end face of the port, the body portion further comprising an alignment collar arranged circumferentially around the connection port, the alignment collar being provided with an alignment feature at a discrete circumferential position for angularly aligning the mating connector with respect to the connection port, wherein the body portion is surrounded by the cover portion, wherein the connector is characterised in that: the cover portion has an access hole for alignment with the mounting hole in the substrate, the connector further comprises a backing portion arranged to extend in another plane parallel to the flexible substrate behind the cover portion, such that the substrate is sandwiched between the cover portion and the backing portion, and the body portion is integrated with the backing portion and projects through the mounting hole in the substrate and the access hole in the cover portion, wherein an outer periphery of the cover portion is cut away at diametrically opposite positions with respect to the connection port to thereby allow improved access and/or flexing of the flexible substrate in said positions when disengaging the mating connector. the cover portion has an access hole for alignment with the mounting hole in the substrate, the connector further comprises a backing portion arranged to extend in another plane parallel to the flexible substrate behind the cover portion, such that the substrate is sandwiched between the cover portion and the backing portion, and the body portion is integrated with the backing portion and projects through the mounting hole in the substrate and the access hole in the cover portion, wherein an outer periphery of the cover portion is cut away at diametrically opposite positions with respect to the connection port to thereby allow improved access and/or flexing of the flexible substrate in said positions when disengaging the mating connector.