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Yes but...
The ships are deployed on long term contracts in the Atlantic, Mediterranean, Northern Europe, the Baltic and Indian Ocean.
Presumably those 4 vessels aren't completely unbooked from April, right? I think generally finding companies who own vessels is probably not that difficult, but - and this is entirely my assumption though! - I'd expect them to have contracts quite a bit in advance, so they're probably not free at such a short notice.
What if the UK Government had a long term relationship with an experienced shipping company for the provision of roro services, say for the MoD?