Ignition barrel/ steering lock issue Astra Mk4 G Bertone Coupe 2002.

I have an issue with my steering lock/ignition. The key is getting stuck between 1 and 0. The car turns off etc but will only turn half way between 1 and 0. After wiggling it about will it finally turn and engage the steering lock. I had a new ignition barrel and ignition module less than 10,000 miles ago. I can't find any part numbers or seem to find a new one anywhere. Any help or advice from this large community would be helpful, TIA
 
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