Exeter to Portsmouth - missing Advance fares

[Nigel]

I had been looking to book a journey from Exeter (St David's) to Portsmouth Harbour on the morning of 13 May. When I was looking at the beginning of this week there were advance fares available on routes using only GWR services, and no fares quoted for other routes, presumably because it was still outside the usual 90 day booking window. However, when I check now, the only fares quoted on all routes are anytime singles. Sometimes a lack of advances is because the timetable is not yet confirmed because of possible engineering works - but in that case why were GWR offering them earlier?
Does anyone know what might be the explanation?

 

[Alex365Dash]

Seems they're still offering advances - both with South Western Railway then Great Western Railway (changing at Salisbury)...


...and GWR only (changing at Westbury).

 

[Nigel]

How very odd. Yes - I can now get these. I tried the National Rail site just before I posted this morning - and it did not come up with these options. Now when I try the National Rail site I just get an error message, but GWR were not offering them yesterday evening. Ah well - just one of these computer glitches designed to question your own sanity.

 

[paul1609]

How very odd. Yes - I can now get these. I tried the National Rail site just before I posted this morning - and it did not come up with these options. Now when I try the National Rail site I just get an error message, but GWR were not offering them yesterday evening. Ah well - just one of these computer glitches designed to question your own sanity.

At a guess its been because of the landslip closing the line south of Salisbury.