Sorry, forgot to turn on verbose.
Full error message is as follows:
Artemis SVL Bootloader
Script version 1.7
Phase: Setup
Cleared startup blip
Failed to enter bootload phase
Phase: Setup
Cleared startup blip
Failed to enter bootload phase
Phase: Setup
Cleared startup blip
Failed to enter bootload phase
Target failed to enter bootload mode. Verify the right COM port is selected and that your board has the SVL bootloader.
Many thanks, APS