Here you are boycie.
You have two relays which control the speed of the fan, 1506 is the slow speed and 1509 the high. 1509 comes on at quite a high temp if I can remember so you might of stopped the engine before this came in.
The slow speed should have been on though. This goes through a resistor 1505 (when you see it it looks like a large coiled spring) but also in circuit with this is a thermal fuse (looks like a miniature metal firework with a colored top) which runs through the middle of it.
First check fuse MF1 which is hidden down the side of the engine fuse box. You might have to disconnect the battery feed to lift the unit out.
This is a large "Maxi" fuse.
If that's ok check continuity across the resistor and thermal fuse.
Check all connections.
A good way to test the circuit is to disconnect the water temp sensor on the thermostat housing and then start the engine up. The temp gauge will go into the the red and stop light will come on and so should the high speed fan.
Item 6 is the resistor unit and the two 7's are the relays.
Let us know how you get on.