hi sean
http://www.mendmy.com/answers.php?id=93515
http://www.howtomendit.com/answers.php?id=93515
there you go
Glow plug relay is usually fitted directly underneath the battery tray. To access you have remove the headlight.
I'm told it usually costs about £50.
The relay is on the Drivers side engine bulkhead a small black box. You can start the engine without the the relay working by squirting a small amount of easy start in the air filter before turning the engine over.