My hubby has replaced the head gasket of my beloved fiat punto, 1.2 1999.
Everything has gone fine, but when we try and start it won't fire.
Any ideas??

You said it won't fire. Is it getting injector pulse?
Since the battery was disconnected, does the vehicle have a factory security system that may need relearned?
Check all connectors and all fuses.

We realised that it was something to do with the timing, this has now been corrected (we think) but is now rough on idle, any ideas?