Thanks for your assistance, which leads me - as always - to more questions.
1. I don't have a /usr/src/linux or /usr/src/linux-2.4.22 file at all, presumably this means the kernel source files are not installed.
2. If this is the case do I need to download them from www.kernel.org
3. If this is not the case and they are just hiding somewhere, what do I do then.
4. With regard to the actual driver, the README file says unpack it then cd to the directory and run ./install, but doesn't mention anything about make install or anything, do I just run with what the README file says.
Many thanks