S14a not firing .

I expect this has been covered a few time already.
I own a s14a S reg 1998 . Stage 1a Horsham chip.
Has been sat for 8 months but did drive it last weekend . No issues when I drove it then.
Went to start this evening, started for 5 seconds and now the engine chexk light is flashing. Its turning over but doesn't seem to fire.
Have also tried the spares key and still not firing.
Someone said it could be nats, but any help would be appreciated.
Thanks

Checked the loom over the front drivers wheel arch? Its amazing how much goes haywire when the looms been rubbed through