Well,I had a look again this evening and fiddled around with various things but still no joy.
I removed the relays and fuses associated with the fuel pump and cleaned the contact areas but still the same problem.

I couldn't see any vacuum leaks but I'll have a better look tomorrow and check the air flow meter with a multimeter.

The fuel pressure regulator,I never thought about that I'll look into that as well

But alfa's,you've gotta love em,that loud clicking noise that I mentioned earlier was the air conditioning clutch working for the first time since I bought the car 4 years ago!
So although the engines not running worth a damn at least the aircons working