Penny has been banging on about these for years - ever since she was i/c international aid.
That the announcement - which btw is nothing more than a press release trailing the idea and definitively not a funding commitment or build contract announcement - is timed to coincide with London International Shipping Week, screams attempt to generate publicity and interest for these in the maritime industry. It's no coincidence they have a "Donate" crowdfunding function on their page.
If you're interested, it's this lot.....
Britannia Maritime Aid | Ruling the Waves