Thanks For everyone's help so far. I'll check the air leak tomorrow, and will do the test.

Ok, so today I spent a few hours on the car again, there wasn't a fuse in the "heated seat" space so I put this in (slightly different noise now when ignition is switched on). But still know change! The car starts fine, revs got up to around the 900/1000 mark for about 4-5 seconds and then stops. Same over & over again.

Ive attached further photos of the fuse box & engine maybe there's a relay or something from the fuse box..?

I might order a new fuel accumulator, thermo time switch (brown plug on the back of the inlet manifold) and cold start injector as I've been told maybe one of these may be the problem...

Sean