“A ship in port is safe, but that’s not what ships are built for.” ~ Grace M. Hopper
I think this is some sort of warning lighthouse type boat from the little tower that sits on top of it. The Thames can sometimes be a very foggy place and I assume this bold red ship sets out when that is the situation to help guide the traffic on the river and while it is not needed it is kept safely here in this basin dock waiting for it moment to perform
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