I did check your garmindevice.xml and the are nothing that stands out.
The garmindevice.xml show the UK & ROI installed as the gmapprom.img
You might be onto something with the unlock codes ,I'm just running some tests at the moment...........
OK, it appears the .unl codes Garmin Express is creating for UK & ROI do not have the correct product number of the map,and the Foursquare .img has the correct one.
Spoiler: Image
Check your PM.
I've uploaded Full Europe with unlock files that are valid for your device to put on your SD card
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