A question:
Is this a Royal Yacht for the use of Her Majesty the Queen or is it a vanity project for our 'potato in a wig' Prime Minister?
I ask because the Government website says this:
New national flagship to promote British businesses around the world
The ship, the first of its kind to be built and commissioned by the UK, will boost British trade and drive investment into our economy. The vessel will be used to host high level trade negotiations and trade shows and will sail all over the world promoting British interests.
A typical six month itinerary for the flagship might include docking at a port in a country where a British Prime Ministerial visit is taking place to accommodate parallel discussions between British and local businesses, hosting trade fairs to sell British products to an emerging market and providing the venue for an international ministerial summit or major trade negotiations between the UK and another government.
There is no mention of it being a Royal Yacht.
If it is a Royal Yacht that the Queen can lend to the Prime Minister then fine. However, it's a Boris vanity project that he can choose to lend to the Queen then no way.