It seems that Huawei is not quite ready to launch the Watch D in Europe or the UK. According to a company spokesperson, important features will be unavailable until 'later this year', with no timescale given. Meanwhile, only 11 countries will be able to make use of the Watch D's full functionality.
https://www.notebookcheck.net/Huawei-Watch-D-Blood-pressure-monitoring-and-ECG-features-to-launch-after-smartwatch-debuts-in-Europe-and-the-UK.621712.0.html