Thanks, great tip.

I had a Samsung T5 (500GB) spare so I decided to give it a try.
I did a few extra steps ensuring I had updated everything including the bootloader before I started.
After I had copied my SD card to the SSD the root partition was the size of the remaining disk. I used "GParted" to shrink the partition to 60GB to make it easier to copy. Then I created a new partition with the rest of the disk space and moved the Pictures folder to that partition.

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