E34 525i won't start

Hi Guys

Hope I can get some assistance....

Preface: Decided to clean my MAF and also check the state of my air intake rubber boot on Sunday. Did all of that, checked everything is in the right place and not missing anything. Started it, started fine (no funny sounds etc.), switched off.

Didn't drive it at all. This morning, I had to go write an exam and it won't start.

What happened: Insert key into poisition 3 (before the engine cranks), can hear the 'click' sound, full battery power, nothing on the dashboard indicating abnormalities, fuel level is on the "20". Tried to start,
it cranks but it just doesn't want to ignite.

Exactly like this in this video:




Could smell a faint hint of fuel when I went to the back the first time, it was quite cold in the morning but had never hindered from starting the car.

Diagnosis:
-Checked the fuel pump fuse, nothing wrong, cleaned it, put it back.
-Re-inserted fuel pump relay, nothing wrong, cleaned it, put it back.
-Checked the fuel pump itself, after removing it and hooking it up to a 12V battery, works, ensure wirings were correct and tightened, put it back. However I do not hear the whirring sound when you start the car.

Have Not Done:
- Check crank position sensor, ignition leads, rotors, spark plugs etc.
- Use a jumper to check fuel pump relay.
- Fuel filter? fuel pressure?

Any other suggestions greatly appreciated