Hi Martin,
Problem is that the Sony won't boot from USB, it has a Phoenix BIOS which only has Floppy, CD, HD and something else (not USB but it might be LS120).
However, you got me thinking and looking at the Phoenix site, it states that the Phoenix BIOS will boot from USB, so I may be able to flash the BIOS to a version that does boot from USB which would definitely solve the problem as I could then load XP from an external CD drive
Thanks