Vectra Diesel 2.0 Starting problem

[Slick]

Makes absolutely no difference parking uphill/downhill...

[TJVanman]

In also have a 98 2.0 Di, which has just started to play silly b**gers last week , wouldn't start, no Glow Plug lamp, so I called RAC, 2 hours later, they came and guess what it started first time.

Anyway they checked it out and told me I needed a new Glow Plug relay (£36.97) and guess what, still the same, only refuses to start at all now.

I have now gone and bought 4 new Glow plugs (£78), waiting to see if this works, as me battery is now totally flat, though I am still not convinced as to this being the only problem, as I still think that there is a cheeky little relay somewhere that has been playing me up.

So can anybody out there tell me the strategy for the glow plug/ ignition, or send me a decent wiring diagram.

By the way, where is the fuel cut-off switch??

Cheers