Upper tether for child safety seat

An upper tether attachment system for a vehicle seat, comprises an auxiliary strap (20, 26) adapted to extend from an anchorage (18) on the vehicle behind the vehicle seat back (12), over the top of the vehicle seat back (12) to a coupler (28). In use, the coupler (28) is engaged by a tether strap connector (30). A U-shaped clip (34) engages round the upper edge of the seat back 12 and holds the coupler (28) in position on the seat back (12) prior to attachment of the tether strap connector (30).