Unless I've overlooked something, the Class 33 can only be used on West Somerset Railways. It can't even be used for Railtour services, as far as I've seen. Would love a bit more options to use my Class 33 please.
Personally i'd like to see pretty much all older UK trains available as rail tour locomotives where possible, An exception might be the class 08 and 09 since they have a top speed of about 20-25mph and on routes like East Coastway and South Eastern High speed the fastest they can go on their routes is 90, but things like the class 40, 20 etc surely can substitute on most British routes, I mean the class 20 is on SEH but not EC
Since it has a Blue Star MU equipment why not layer her onto Tees Valley Line where you have Classes 37 DLC 20 & 31 and NTP Class 45 DLC Class 40.