Bojo does like a vanity project though in order to provide him with some form of legacy for the future
Every Prime Minister wants to leave some form of 'legacy', something to be remembered by. In my honest opinion I think the last PM to achieve that was Harold Wilson who founded the Open University, a fantastic legacy. Well, that and shagging his secretary for all those years and getting away with it.
respect to the bloke though, decent PM, as was Callaghan, sometimes though, you get the right person at the wrong time, The trade unions destroyed Callaghan, which of course allowed Maggie (peace be upon her) to take over. It's a funny old world.