Love to know the cost of one of those.
I doubt that it will be pocket money pricing. BAE make the boats and, I suspect, much of the control equipment.
A 26-year-old example is for sale here at 45k:
Add in a Pixhawk controller, some heavy-duty servos and decent TX / RX and you can make your own version for just a grand more.
But with BAE being a defence contractor I’d reckon on around 500k once the systems are in series production. I’ll see what I can find out.