Having the wires up at Basingstoke suggests that one of the logical next extensions would be to Salisbury & remove some diesels from Waterloo.
Presumably also allows for some diversions via Reading & Staines if the line via Woking is unavailable. (though obviously limited in number due to having to go through Reading station & connect onto the 3rd rail lines)
Which will eventually lead to a rather tantalising gap between Salisbury and Exeter with wires at both ends, assuming that after South Wales, Plymouth is the next target followed by Cogload Junction-Newbury. It's more an electric 'tibia and fibula' than a spine, but I hope it happens before long.
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For someone who went to secondary school in southampton by train in the late 70s the thought of that area getting Overheads is still quite amazing . So , because I had far too much time on my hands and an old copy of trainz2006 i thought hmmmm what would a cab ride look like post 2019 .
http://www.youtube.com/watch?v=0ETIMdsUBw0
Yes I know . Dont take it too seriously
Oddly fascinating to see those alien structures down there, thanks for that, even though there did seem to be a few gaps in the wires there (sorry).