Too many loose ends.
1. How did Macguire get hold of Hudson’s phone?
2. Why did he go to the army base - just to send a message?
3. Where did he get the HMX explosives from?
4. Hudson marked bomb sites in his A-Z, how was he able to mark the Alliance Party’s HQ when at that point there had been no bombs?
5. How did Macguire gain access to Billy’s car?