Where have all the advanced fares gone?

[BeccaOnATrain]

This is only based off a few searches - but I haven't seen any for trips I've intended to make for a few weeks now.. Normally I can buy them on the same afternoon of a trip I had planned.
I travel regularly using EMR between Manchester<>Nottingham and various stations between, a few times a week. Tonight for example - I'm wanting to travel on the 20:53 Stockport to Alfreton but all I see for that trip on today and the next few days I've looked are Super Off-Peak Day Single tickets?

Any ideas? Travelling is about to get a lot more expensive for me if these are no longer purchasable. Hoping it's just the Christmas holidays and it's because the trains are busy and they've just sold out already?

 

[Angmering1974]

Piccadilly to Alfreton has cheap Advances from tomorrow onwards

 

[Watershed]

I would imagine the WCML closure between Milton Keynes and Northampton/Rugby is causing those EMR services to be much busier than normal between Manchester and Sheffield.

Journey planners will be routing people bound for Manchester and Stockport via Sheffield, as it's the fastest route under the circumstances and involves the fewest changes.

I'd imagine things will be different once the WCML reopens, although that's not happening for another week or so.