2003 Vauxhall Astra • 90,000 miles

I have a 1.6 8 valv dual fuel astra, its stood for a month without being started, the battery went flat, I recharged the battery as it was brand new, but the car will now not start, it just turns over.
There was no spark at any of the spark plugs so I changed the spark plug leads, plugs and coil pack, but there is still no spark.
Any ideas what it could be? I think there may be a problem with the immobiliser, but I only have the standard key so I cant reset the immobiliser with the key. (Non central locking key).
Cheers for any help.
February 12, 2013.

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