2005 Jimny 02: Won't start, driving me insane!

Hi peeps

Please forgive my ignorance, i'm new to forums!

So I have a 2005 O2 Jimny with a full service history and 67k on the clock, it's been great fun and really reliable until now....

It was working fine and then wasn't started for maybe 3-6 weeks, still had battery power fuel etc and turns over but refuses to start. 
I've changed both the CAM sensor and the crank sensor after reading these were common faults, no change. 
It doesn't spark and as far as I can make out the fuel pump isn't engaging either (after turning over for 30secs to 1min there is no wiff of petrol in the engine bay in the slightest) even if you crack the fuel injector feed line, nothing. 
Bearing in mind the above i'm assuming that it could be the immobiliser? 

Would really appreciate a steer of what to do/where to go next with it please
 

Welcome to the forum. When you turn on the ignition do you have a solid yellow padlock symbol or does it flash? Flashing is an immobiliser issue. Do you have a second key?

Cheers, nope no padlock light, tried the second key too, same issue. ??

In the same boat as you Flynny try disconecting the battery and tip the + and - together to get the last out of the circuit and give it 30 mins and try again.
Im off to he shed now . J

Well, scratch that off the troubleshooting list as not working as a fix.
 

I've a scan tool and a Suzuki app if that's any use to you