This is because of VAT issues caused by the Brexit. We are obliged to separately submit a tax return for the UK and have to be able to accept UK VAT numbers from customers. At this point in time the HMRC API is not working properly to check VAT numbers if they are indeed valid.
Once everything is working properly, you can select UK as country again.
If the issue is solved, it will take quite some time as in months.
Currently there are a lot of requirements from HMRC. We are still looking into this how we can efficiently solve this and what it will mean for us in the future.
It's been 9 months what's worse is the fact codster added location detection which means changing country is not optional. This is really bad for business I wanted to buy something for $50 and looks like I have to find another site.
I don't know why you don't add default 20% tax like everyone else
This has left really sour taste in my mouth and lack of confidence me spending any cash with this platform in future.