Phase 2 should consider systems to detect and report concerning online behaviour and suspicious combinations of purchases. This should include consideration of:
1. Concerning patterns of online browsing and purchasing (e.g. change of names and addresses, use of Virtual Private Networks).
2. Concerning purchases of dangerous but legal items (e.g. sledgehammers, bow and arrows and smoke grenades).
3. Concerning combinations of purchases (e.g. castor beans, alcohol and laboratory equipment).