Do as the haynes manual says, pull the coil lead off the dizzy and hold it close to the head (5mm) gap and crank it over. You should have a spark.

If you have no spark, you need a 12 volt test lamp (just a normal indicator bulb in a holder with 2 wires will do, or you can but a cheap one from Halfords for about a fiver). Connect one lead to the battery negative (the one with a croc clip if it's a proper test lamp) and the other lead (or probe if it's a proper test lamp) to the negative side of the coil (should have green wires to it, and you must leave it connected to the coil). With the ignition on, the bulb should light up. When you crank the engine over, it should flash on and off repeatedly. If it doesn't flash then the coil is not being switched. You are then looking at either the ECU, wiring or dizzy sensor.