Hi, Yesterday I managed to get an AWC Advance for Saturday 11th December, Nuneaton to London at 06.59 and return on the 17:07 London Euston to Nuneaton. So some advances are around it does take a bit of luck and good fortune. As regards notifications I use Trainline Ticket alert, there are boxes to fill in for email, date of travel and journey and as soon as advance tickets are released you get an email. I just copied this from the same page, it gives dates currently for each TOC that tickets are released for.
Advance ticket booking window
Advance train tickets tend to become available in the UK 12 weeks before the departure date. These are the latest dates that we've found tickets available for**.
| Avanti West Coast | 31st December 2021 |
| Chiltern Railways | 23rd December 2021 |
| CrossCountry | 17th December 2021 |
| East Midlands Railway | 23rd December 2021 |
| Grand Central | 4th February 2022 |
| Great Western Railway | 14th January 2022 |
| Greater Anglia | 17th December 2021 |
| Hull Trains | 11th February 2022 |
| London North Eastern Railway | 7th January 2022 |
| London Northwestern Railway | 23rd December 2021 |
| Northern | 2nd December 2021 |
| ScotRail | 23rd December 2021 |
| South Western Railway | 24th December 2021 |
| Southeastern | 13th December 2021 |
| Southern | 24th December 2021 |
| TransPennine Express | 27th March 2022 |
| Transport for Wales | 8th December 2021 |
** We attempt to detect when Advance tickets have been released each day by analysing the results of millions of users’ journey searches. There may be interim dates when timetables and Advance tickets are yet to be confirmed by train operators. We’ll do our very best to alert you as soon as our systems detect availability. If you do not receive an alert, check back in before you travel to book a ticket and reserve a seat.