I reccomend that the London route gets expanded to Swansea. It’s not too long as it’s 164 miles. Also the GWR Class 800/1 and 800/2 could be added.
A) route is far too long B) no GWR license. All that can be done with the current route is a remaster (which does not include any extensions or new rolling stock).
I thought I saw a post by Matt I think on the forums here that a remaster "could" be done but nothing new as stated due to the license being lost.