I would start from scratch and prioritise a high speed link from East Lambeth to Blacbury (at the very edge of Zone 27). The line could be called the Electric Boggoloo Line and the train the Boggwarts Express. It would need a new colour on the tube map (Oxford Blue, naturally).
And this leads me smoothly onto my latest plan, which involves BUBB taking over the running of Britain's enchanting canal network. We would keep it obsessively organised and tidy, sort of canally retentive. Also our friends at NCVO have their offices next to the Regent's Canal and it would be strategically very useful if I had unlimited access to the waterway at that point so I could go past in a boat all day long shouting things at Hubert.
You can tell when a sector is on the rise when there are queues of graduates (not all Oxford, unfortunately) desperate for a job, any job, even in brollyland. But it is also nice that the public sector is keen to offloads large chunks of expensive infrastructure responsibility onto those who will consider getting involved anything whether it be core to their interests or not.
As Mark Twain once wrote: "Always acknowledge a fault. This will throw those in authority off their guard and give you an opportunity to commit more."