Thanks for the advice/welcome.
I have used EasyBCD 2.0beta to copy the NTLDR, boot.ini and ntdetect across all drives. Now I can triple-boot into 7 or my 2 Win XP installs again.
However, the dual-boot seems unstable! For example, this morning, first time i powered my pc on, it booted directly into the XP boot menu (ignoring Windows 7). I pressed hard reset, 2nd time I landed at the Windows 7 boot loader, and was able to load Win 7. Mystifying!
The upshot is I now cannot boot into Windows 7 without the Windows 7 dvd in the drive and the bios set to boot from CD drive as 1st priority. If I remove the dvd, my pc skips the Windows 7 bootloader altogether and gives me the old Win XP boot menu....
Snip of my disk-management screen (OS partitions are WinXP1, XP Music and Windows 7 HP) :