There certainly was a 1h45m London-Manchester journey time objective under PUG2 and London-Glasgow ambition was 4h12m. ( See this link to download a Parliamentary report from 2010:
The Wikipedia page suggests a 1h London-Birmingham journey time although I‘m struggling to find a source, although it does ring a bell and sound realistic alongside the Manchester figure.
I’m sorry but those times are wrong. The London - Manchester headline time was 1h52/3 via Crewe only. The times quoted in that document are the base running times only and exclude engineering and performance allowances. If you add the (typical) 7 minutes of those to the London Manchester time quoted, you get 1h53. Similarly add the 12 mins engineering allowance on a Euston Glasgow and you’re pretty close to the current Glasgow time. (The proposed stopping pattern was different IIRC).
At some point I will go and dig out the WCRM functional specification, which has all of this in it.
Anyway back on topic - the issue is largely fixed.