This sort of thing - from my mailbox - is not untypical and it shows (when you investigate) just how truely dreadful the pubolic transport links are between these two major urban connurbations - especially on a Sunday.   I ended up replying with a "via Reading" routing and a Saver Single ticket of 29 pounds .. but in the uneasy knowledge that 7th September is the very day that the fares change and we're looking at a whole raft of new names.    True to form, the "lower fares may be availbale via a slower route" button offered a dozen fares from 6.50 up, but clicking on each of them I got a further message to tell me it wasn't available ....

National Express offered a higher fare, can you believe, routed via Heathrow.

And the fare on the direct 06:15 train the following morning?  A startling 45 pounds for the journey of about 60 miles - "railway robbery!".    Buying a Swindon to Warminster (11.40) ticket and a Warminster to Southampton ticket (16.10) would save 17.50 ....