Well in true "bad form" style, I am replying to my own post.

After a lot of 'tweaking' I almost got the toolchain to build, but it does appear to have almost built it, and has infact done enough for me to be able to build the stock 2.0b13 kernel under Cygwin (haven't tested it yet as I don't have my empeg with me, anyone feeling brave?).

Anyway the modified Makefile is attached, should anyone else want to try, when it fails on glibc - db2 you may need to cd to build-glibc/build and do a make install to get what it has built into the correct place.

I also tried building a kernel patched to Hijack 301, but that fails on something in arch/arm/mm/mm.o and I haven't looked into that yet as what I already have may be enough to allow me to continue working while I am travelling.