My KK is Sandvik tubed, I suppose any Sandvik frame could utilise a sleeve.
Panic over, I went to my LBS and had the seat tube measured, it actually came in a smite under 27.0! , although the chap was using digital vernier calipers.
He fitted a cheapo brand 27.0 for me which had the same amount of play in it as I decribed earlier, but commented that this was a perfect fit, and proved it with a 27.2 that wouldnt go near fitting the tube.
So I was just being a bit paranoid! . Still, I'll probably go with the Salsa clamp just to help things stay tight in the future.