^thanks for the advice.
After spending most of the morning scouring the internet I tried using EaseUS backup tool as recommended at a couple of places. Cloned the drive in the same way as the Samsung software, but it worked this time!
Shiny new SSD installed and optimized. It's like putting a turbo on the back of a bicycle
Edit: Was also slightly funny/annoying that the Crucial USB dock that I bought to do the cloning with came with a cloning software CD (Acronis True Image) and the CD was empty!! Just figured it wasn't meant to be at one point...