I finally got round to running 'make-kpkg buildpackage'... And installed the resulting debs. However /usr/include/linux still hasnt been updated to the current kernel headers, is this "normal" behavoir for that, I thought it would update them... Help please!
I've come across this aswell and it is well documented in make-kpkg.
The solution is to also install the relevant "kernel-headers-x.x.x.deb" package in the /usr/src/ directory.
DF.