The thing is, you can cast any number of weird and wonderful routes through London, but journey times will be poor. Commuters won't be tempted if they have to get up in the early hours to arrive in London by 9 am!
I am not really thinking that a lot of business might be derived from this traffic, my own thoughts about this concept of another way of doing
TOCs▸ , is perhaps looking at less time sensitive traffic - although equally, I do believe that if you get them the right service, then people may buy into a longer journey time. It's all about engaging your customer base, rather than seeing them almost as a necessary evil
And I think most routes into London are full (esp at peak times), and Southern/LO won't appreciate you eating into their few spare "recovery/reliability" paths, and taking up valuable platform space with your old and unreliable diesel rolling stock.
It may be old, but my point is that, if you operate units that have enough firepower - i.e. top and tail, then reliability is not an issue
I don't want to be nasty about any suggestions, but I think that in this case, where there is no space, just provide a well timed connecting service (i.e. at Swindon for TransWilts; Taunton for Mindhead). No need for Open Access; I don't think this should be beyond any competent TOC...
I think you are absolutely right here, but given the financial pressure on TOCs, are they mindful of thinking of more peripheral ways to enhance revenue? I read recently news of a report done by one of the heritage railways that showed the value of their business to the local economy and think this is one of the most powerful, but unused arguments for more rail travel. It is not just about A to B, but the much wider benefits it brings to businesses both in those two locations, but also en route.
And say a local/specialised TOC fed to the one of the 'main' TOC routes. Isn't that a win-win for all? Minehead is a good example, as is Swanage. Yet, it strikes me that the powers that be - Network Rail, really arent desperately interested in these kind of fringe benefits