Ive just come accross a solution (of kinds), incase anybody else has the same issue.
I re-configured the old router as basic switch (turned off wireless and DHCP, and set it an IP address in the format of the new router.
I then attached this router (via one of its LAN ports) to the lan port of my new router, and after a few attempts, the HDD showed up within Safepoint! Hooorah!!!
I know this is going to be slow, but its better being slow than not being backup up at all!
Thanks for all your help
