I was accepted to grad school and my lil man's rabies titre came back positive.

Now just trying to decide what to do, what needs to be done, and how much money I need to make it all happen in 4 months.
There are so many things running through my head at moment...I hope that someone will be kind enough to answer my questions. Sorry if they have been answered previously.

1. Do you think I will have any trouble finding flatmates and a place to rent considering I have my dog? (he's only 4.2#s) I'm assuming that I will need to live with 2-4 people in order to afford rent in London?
2. Can you take your dog on buses, the tube, or train as long as he's in a bag?
3. How much does a UK doggie passport cost + the normal cost of vets there?