Jimny turns over but no spark or fuel

Good evening all. I am really hoping I can get some help here. I have a jimny (2000) and love it. Just spent some good money on a new rad and had all the rust done.
Now the problem. A few weeks ago I left the lights on and the battery died. I needed a new one anyway so bought one from Halfords, fitted it and it started. I drove home parked up and four days later it just turned over but wouldn’t start. My local garage picked it up and got it going, apparently a fault with the earth feeding the coils. I drove it for the weekend then parked up again. A few days later it did the same thing. Only difference is now the garage said there is no spark and no fuel.
I have spent some money on it and it’s in good nick. I want to safe it but they are at a loss as to what is wrong. If anybody can give me some advice that I can pass on I’d really appreciate it.
Kindly
Donovan

Is the orange padlock symbol on on the dashboard? Sounds like either an immobiliser fault (using a spare key that hasn't been coded to the immobiliser?) or the ecu doesn't know the engine is spinning, which would suggest the crank position sensor

Which engine is it?