I do enjoy driving the class 801/1 and 801/2. However I do feel like ecml route could do with another high speed beast. Preferably the class 91, as they still run on the ecml so it would be realistic. If also possible. I'd absolutely love to see 9 mk3's in HST services too as that would also be amazing as that's the LNER consist the Hst ran back when they were in service.
Don't know about the HST as they were taken out of service before the time period the ECML takes place, but it desperately needs the Class 91.