There are already 6 TPH Euston to Birmingham aren't there?
extending the services that currently terminate at Lancaster to Glasgow.
There have been various reports of 4 tph to Birmingham and Manchester
Are there plans for 2TPH to Liverpool?
No. Why would there be?
Hows that going to work on the Cov corridor then? They've already destroyed the local/semi-fast service patterns enough to force 3tph through...

It is the local New St International that screws things, after International there is more white space.
In fact I wonder if the new franchise holder would be able to have 2tph for off peaks to save on costs.
The franchise spec allows them to state, for instance, they want to axe one of the Manchester services in favour of a 2nd Liverpool or a 4th Birmingham.
is there somewhere else that the Holyhead / Cambrian Coast ATW service could go in lieu of Birmingham International? This would free up a path every hour wouldn't it? As I recall it only got extended a couple of years ago, I assume because of primarily lack of free platforms at New St and the airport connection.
Derby could be useful, linking the East Midlands with mid Wales again
I remember there being something about four tracking part of the COV-BHM route a while back, but can not remember which part. I know it wasnt going to be much of it though.
Already is 3 minutes Cov to International, 4 from International to Proof House.Based on the current arrangement, I had a bit of a play on Excel (nothing more technical) and reckon that if you could get away with a headway of three or four minutes then the following should be possible:
4tph VT calling International Only
2tph XC calling International Only
2tph LM calling International Only
2tph LM calling all stations. Probably looped at International
plus a couple of freight paths should still fit in this too.
Walsall?
Are you sure about that? The minimum number of weekday calls at Piccadilly is 85. That would require a 2 tph service to run 24 hours a day.