All the records you mention are 100% classic northern soul records, with the crucial ingredient: Soul. I haven't heard the Verve 45s in a club environment for years, but both would sound great now. as Christian says, the International GTOs has recently been flirted with because it's always been a reasonably big collectors' record.
There are literally tens of thousands of classic oldies (which haven't necessarily been over-exposed in the past) that could be played, but aren't; mainly because a lot of dejays have little knowlege and even less taste.
Seems like it takes a re-activation from Butch to make an oldie "massive" (ie on everyone's wants list) again these days: look at the monetary values of records like Johnny Howard, Carol & Gerri, Roy Robert on Tina, Billy Hambric on Drum and so on, in the last couple of years.
The fact is that in looking for different types of sound to play in the post-Stafford era, the thinking about what constitutes a great Northern Soul record has been lost somewhere. Hence we get treated to interminable sets of Trotover, Tumbleweed, Popcorn etc. from deejays who have probably never heard The Ambers' clarion call to the dancefloor.
Brilliant and relatively cheap records are staring people in the face on many sales lists on virtually a daily basis in the current climate. My advice to collectors would be to take a chance on something that isn't on what increasingly seems to be a "National Wants List" and give us all a break from the non-soul crap like Bruce Cloud and Kenny Lonas.
Bessie Banks would be a good place to start.