Lamp is broken
Power not on at the consumer unit - no the other lights work
Wires to dimmer terminals not stripped properly - no it works fine on a normal single switch
Wires not properly secured in switch terminals - no checked that
Fuse in dimmer switch needs replacing (if it has one) - no fuse
Dimmer switch is faulty - must be this! Great....
Dimmer has a minimum loading which is higher than the lamp currently fitted - no
If none of those, then