A vehicle suspension damper comprising: a cylinder; a damping fluid disposed within said cylinder; a piston assembly disposed within said cylinder, said piston assembly comprising: a piston having a flow path (110, 112) formed through said piston; a shim (115, 116) disposed to meter a flow of said damping fluid through said flow path; and a first piston rod coupled to said piston; and a bypass assembly providing a fluid pathway between a first side of said piston and a second side of said piston, said bypass assembly comprising: a remotely controllable valve for permitting or preventing the flow of said damping fluid through said bypass assembly, said remotely controllable valve controlled based upon a variable parameter associated with a vehicle to which said vehicle suspension damper is coupled, said remotely controllable valve comprising: a closing member comprising a moveable piston; a seating member selectively positionable with respect to the moveable piston; and a biasing element interposed between the moveable piston and the seating member to bias the seating member in a direction away from the moveable piston. characterised in that said bypass assembly comprises: a coil spring preload blow off assembly, said coil spring preload blow off assembly comprising: a coil spring piston having a first side abut to a second piston rod that is coupled to an opposite side of said moveable piston from said second piston rod, a coil spring fixedly coupled between said coil spring piston and a preload adjuster, the preload adjuster providing a variable level of compression to said coil spring to vary a force required to open the remotely controllable valve. a cylinder; a damping fluid disposed within said cylinder; a piston assembly disposed within said cylinder, said piston assembly comprising: a piston having a flow path (110, 112) formed through said piston; a shim (115, 116) disposed to meter a flow of said damping fluid through said flow path; and a first piston rod coupled to said piston; and a bypass assembly providing a fluid pathway between a first side of said piston and a second side of said piston, said bypass assembly comprising: a remotely controllable valve for permitting or preventing the flow of said damping fluid through said bypass assembly, said remotely controllable valve controlled based upon a variable parameter associated with a vehicle to which said vehicle suspension damper is coupled, said remotely controllable valve comprising: a closing member comprising a moveable piston; a seating member selectively positionable with respect to the moveable piston; and a biasing element interposed between the moveable piston and the seating member to bias the seating member in a direction away from the moveable piston. characterised in that said bypass assembly comprises: a coil spring preload blow off assembly, said coil spring preload blow off assembly comprising: a coil spring piston having a first side abut to a second piston rod that is coupled to an opposite side of said moveable piston from said second piston rod, a coil spring fixedly coupled between said coil spring piston and a preload adjuster, the preload adjuster providing a variable level of compression to said coil spring to vary a force required to open the remotely controllable valve. a piston having a flow path (110, 112) formed through said piston; a shim (115, 116) disposed to meter a flow of said damping fluid through said flow path; and a first piston rod coupled to said piston; and a bypass assembly providing a fluid pathway between a first side of said piston and a second side of said piston, said bypass assembly comprising: a remotely controllable valve for permitting or preventing the flow of said damping fluid through said bypass assembly, said remotely controllable valve controlled based upon a variable parameter associated with a vehicle to which said vehicle suspension damper is coupled, said remotely controllable valve comprising: a closing member comprising a moveable piston; a seating member selectively positionable with respect to the moveable piston; and a biasing element interposed between the moveable piston and the seating member to bias the seating member in a direction away from the moveable piston. a closing member comprising a moveable piston; a seating member selectively positionable with respect to the moveable piston; and a biasing element interposed between the moveable piston and the seating member to bias the seating member in a direction away from the moveable piston. characterised in that said bypass assembly comprises: a coil spring preload blow off assembly, said coil spring preload blow off assembly comprising: a coil spring piston having a first side abut to a second piston rod that is coupled to an opposite side of said moveable piston from said second piston rod, a coil spring fixedly coupled between said coil spring piston and a preload adjuster, the preload adjuster providing a variable level of compression to said coil spring to vary a force required to open the remotely controllable valve. a coil spring piston having a first side abut to a second piston rod that is coupled to an opposite side of said moveable piston from said second piston rod, a coil spring fixedly coupled between said coil spring piston and a preload adjuster, the preload adjuster providing a variable level of compression to said coil spring to vary a force required to open the remotely controllable valve.