Brexit, VAT, minimum order requirement for UK addresses?

[DrByte]

Thanks for this. How would it differ in my situation as I only have GBP as a currency and will adjust the GBP equivalent to the euro tax threshold manually every month.

I suppose if you didn't want to add any other currencies you could just do the conversion by hand and specify [NNN:GBP] where NNN is the equivalent already converted to GBP.
One side-effect to that is that the alert message displayed to customers would say the price in GBP which may be confusing to them if they know about the rule in terms of the other currency.