From Jaycar Electronics I purchased the following:
- 100 degC thermo-switch (normally closed)
- Relay (234 12vdc)
- Wiring loom for relay (with 15amp fuse)
100 Deg C Thermal Circuit Breaker Switch: 
AUTOMATIC RESETTING BI-METALLIC DISC, SNAP ACTING. This phenolic-housed unit attaches to any metal surface. When that surface meets or exceeds certain temperature, the SPST bi-metallic element goes open circuit, i.e. unit is normally closed,opening on temperature rise. The unit resets automatically when temperature falls below specified limit.
Relay 12vdc: 
It was important to choose a "key on" power source as I didn't want the heater on with the ignition off!
Here is the wiring diagram:
Click this link to download a larger pdf version: Glow Plug Heater wiring
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