Its a portion operated train, for some reason Nationalrail cant show these properly.
It actually calls Barnham, horsham(couple to another unit), crawley, three bridges, redhill, east croydon, clapham junction, vic.
SN see the main Pompey market as being to intermediate stations Gatwick, East Croydon and believe it or not because of SWTs weird stopping policy Clapham Junction but 2 hr 2mins will attract the budget market compared with SWTs 1 hr 31 best time, especially given Victorias better Tube connections.
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London-Portsmouth was never part of the BR InterCity network. The only InterCity trains Portsmouth ever saw were Cross-Country services.
Depends on how you define Intercity. Fast Trains from London to Brighton, Portsmouth and even down the Bournemouth branch were marketed by BR as InterCity. If you look at this 1983 London to Brighton film;
http://uk.youtube.com/watch?v=_fRgP-xgrdk a couple of minutes in you'll see "Inter City" displayed on the Solari indicator at Victoria even thought the stock is CIG/VEP. The manual display at Brighton also had Inter City Labels.