Wayne,
That's a tricky one... "up tempo music that people won't dance to" is a real contradiction.
If that was my brief, I would play instrumentals (to prevent people getting distracted and singing along) or little known tracks (to make the desire to dance a little more difficult) or the below 100/110 BPM tracks that have a tempo but not quite...
I know these won't be to everyone's taste but here a some of the less obvious ones I have in my background folder (I'm not suggesting you play these but they were some of ones that I'd throw into the pot)
Porcelain 3:31 Moby Now That's What I Call Music! Vol.46 CD 1 Pop 94 4A - 94.99 2000
La Mezcla (Original Mix) 12:15 Michel Cleis Remix Club Connection Summer 2009 (Disc 3) Hits Ibiza Old School Punk 100 2009 127 3A - 126.99
Quiet Storm (Groove Boutique Remix) 7:42 Smokey Robinson Motown Remixed Classic Motown 80 2 87 S 11B - 85.37 2005
Cupid's Chokehold - Breakfast In America 3:59 Gym Class Heroes Now That's What I Call Music! 67 [CD 1 of 2] Pop 1 79 12A - 79.78 2007
No Letting Go 3:23 Wayne Wonder Now That's What I Call Music! Vol.55 (CD1) Pop 1 100 4A - 100.2 2003