I downloaded the "Windows XP Home Edition with Service Pack 2 Utility: Setup Disks for Floppy Boot Install" from http://www.microsoft.com/downloads/d...displaylang=en
Once I had all 6 floppy disks ready I followed all the steps only to get an error screen after installing the final disk.
One thing that could help is that I found a new startup menu. I only saw it because the external floppy drive delayed the startup procedure by half a second. This allowed my to see an extra option "Press F12 for boot device selection menu".
When I pressed F12 I was given these options:
1. Hard Drive
2. CD-ROM/DVD Drives
3. Removable Devices
4. Network Boot
By selecting "3. Romoveable Devices" I was able to try to boot from the 6 floppy disks, but that was unsuccessful. However, when I rebboted and chose "2. CD-ROM/DVD Drives" everything went fine.
So I'm now in the middle of a clean install of Windows XP (at last!).
Thanks again to everyone who offered their help in this thread.... much appreciated