OK then DGR.
People and goods need to travel right, people to get to work, goods to get to where they are to be sold, things like that.
I am guessing that your "obviate the need for travel" line is something to do with changing this scenario fundamentally? Perhaps you have a very self sufficient life, and/or the luxury of being able to work from home, most people do not. For myself, even if I had this option, which I don't, I wouldn't take it and I don't want it.
Home working works for some people, but not for lots of others.
Perhaps you envision a society where what used to be offices full of colleagues, or classrooms full of school children connect to each other from their homes via the web? Maybe you view that scenario as desirable? I think the loss of real interaction between people that follows from it would be hugely damaging.
As a total aside, I have a new relative in my family who arrived about 6 weeks ago. Seeing her proud new mum and dad holding her on a screen via "facetime" is nice, but it absolutely isn't the same experience as being in their living room, with them and holding her myself.
We need, as an environmental imperative, to stop people flying as much as they do, and to stop people driving as much as they do. High Speed rail with make some headway into both problems. It will also, as stated earlier allow lorries to be removed from the roads.
I honestly can't see how the "obviate the need for travel" or "the entire way people move around the UK will be irreversibly changing" get delivered in 10 years time. Millions of journeys will still be being made in privately owned vehicles (potentially electric or hybrid electric powered ones) but still privately owned vehicles, and still with an now much increased demand for electricity.
So what are the other options I'd consider for £150bn? Putting lots of it into clean electricity generation would allow the needs of electrically powered personal transport to be serviced, but this still has the problem that it is personal transport.
I expect I'm still being dull and unimaginative.