... I suggested loading the panniers to my shippers (bike freights in 2 weeks), he expressed no objection. I am going to try this method and see how I get on, putting my tools and riding gear on board with the bike. I will lock the panniers unless instructed other-wise, but the bike will ship in a sealed crate so I'm not too concerned if I must unlock them.
... Obviously you cannot include 'hazardous goods' such as gas cylinders, cooker fuel etc.