New hourly express trains and westbound only - so not exactly a regular feature of the timetable.
I must admit, I'm not quite sure why on earth they are actually doing it (unless SWT have been infiltrated by the Popular Front for the Liberation of the LSWR), you would think they would stop at least at Andover if not Basingstoke as well. Funny old world.
The only thing I can (sensibly) think is stock positioning ECS workings to Salisbury being put into service. Either way 12 minutes less than their fastest previous service and only stopping at three less stations is a bit odd (would expect nearer 6 minutes saving).
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Are you sure they'd manage it in 2h 23m? The current fastest time is 3h 21m, with 2h being the best from Paddington. Knocking an hour off seems incredibly ambitious, and knocking 2 off to 1h 40m complete fantasy.
In 2007 they did one in 2h 58 despite 8 stops, spending 6 minutes at Salisbury, getting looped at Chard and four minutes at Honiton.
The 2h 23 is based on the 1h 10 mins to Salisbury (as proposed by SWT yesterday) and actual journey times of class 159 operated services in the past.
1h 10 mins Waterloo to Salisbury
30 mins non stop Salisbury to Yeovil has been done in the past by 159s (currently last up train does it non stop in 35 minutes but this includes extra minutes as it terminates at Salisbury)
43 Minutes Yeovil to Exeter with call at Axminster is possible if it gets priority at all the loops. In 2007 the 09.20 SO did Yeovil - Axminster in 19 minutes non stop and the 1720 MF did Honiton-Exeter in 15 minutes. Current minimum for Axminster Honiton is 11 Minutes. Total 48 minutes. Remove 2 minutes for not stopping at Honiton and you have 43 minutes.
1h 40 (an average of 103mph) would need redoubling and 125mph linespeed most of the way from Basingstoke to Exeter (which it is mostly straight enough for other than between Salisbury and Wilton).
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Which is Easter Sunday, as berneyarms said. There are also through trains the next Sunday due to diversions via Banbury and the Chiltern Line, as the alterations for engineering run all the following week until then, but you just try finding a direct Oxford-Bristol train on April 19th or beyond
They were originally going to run the East West Rail trains from Bedford to Bristol via Oxford but I think that is now a dead duck.
Didn't Thames trains run some from Oxs - Bristol a few years back.