The helpful folks at Turner Engineering suggest the following be done to ship the engine:

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1: Buy a pallet
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2: Piece of cardboard
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3: Sheet of DPM stapled on top of the cardboard
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4: 2nd piece of cardboard to soak up any drips
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5: Fill all the apertures with rags to prevent and remaining oil running out and clingfilm everything. (The checkout assistant at the supermarket gave me a funny look as I purchased 3 roles (90 meters) of clingfilm)
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6: Strap the engine (dipstick side down) onto the pallet and hope you don’t need to move it again until someone with a pallet truck turns up