Not much terminates though. A good through station of 1-2 islands is super efficient. Chelmsford handles far more.I'm surprised nobody has mentioned Leicester; it has to have one of the most utilised platforms in the country, with every train stopping with only four available.
But there is call for more Birmingham service, Coventry service - and occasionally, the St Pancras EMU too. All of these would occupy platforms. Luckily there is a scheme exploring the fifth platform, I'm not sure where it landed in terms of which side - Birmingham side / west seemed most likely.
Definitely yes to both of these. Would be extremely helpful to the network as a whole. Reigate I would say moreso, now, due to the Gatwick expansion - and it being better for interchanging (plus addl platforms / all North Downs services going there)The longstanding two in my neck of the woods - Redhill (even though it's just had Platform 0/1 installed not too long ago) and Reigate