UK map deleted and replaced by north eastern Europe maps after Garmin Express update.

Thanks, I tried that, but it only gives me options to upload Regions : Eastern Europe, Germany, or Turkey. Garmin Express tells me there is not enough memory on the device, so I fitted a 32 GB SD card, which is recognised  by Express, and has full capacity remaining, so I don't know why it is limiting the options for maps. I'd be happy with just the UK Map, surely that isn't too large for the available memory ?

No it isn't and difficult to know why you're not being offered both EU North and EU South map if your device originally came with the full EU map, did it? 

Try deleting your device from Express then re-add it.

Thank You, my device came originally with full Europe maps, (I even used it in Greece on holidays). I'll try deleting and re-adding it to Express and see what that does. Cheers.

I deleted my device from Garmin Express, and re-registered it the next day. Tried to "Change Map" again, but I still get the same limited options : "Northwest Eastern Europe", "Germany", "Turkey".  Could there be some problem with my Garmin Account ? It doesn't seem to know my location.

Possibly. Try calling Product Support