Quick update: I RTFM'd the Ultimaker CPE page and glue on the bed is recommended.
I tried one more print with just glue, and the print lifted from the bed halfway through, so I aborted.
It's re-printing now with glue and Adhesion ticked on in Cura, and it looks good!
Nervous to add PVA into the mix; that's up next with the cog model from the toothpaste squeezer..
[Diary of a 3D printing noob/new S3 user..]
I tried one more print with the same materials but a completely different model.
You can see a video of it just after starting here: https://www.dropbox.com/s/dr5s8e1i9r4czxv/bad print.MOV?dl=0
Before that, while calibrating, it was continually extruding small amounts of white CPE, which I wiped off a couple of times in a bid to help it progress.
I then aborted the print. Please see two more images attached:  the bed showing the failed start and  the AA core showing quite a lot of material adhered to the print head.
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