Today ,I got this response from TaiwanGun when I asked if they still use UPS as a carrier.........
Witam / Hello / Bonjour / Buenos dias
Temporarily closure of deliveries to Great Britain
Due to the huge problems our shipments have encountered since Brexit, we have decided to temporarily suspend the possibility of orders for customers from Great Britain.
We cannot allow a situation in which most of our parcels do not reach their addressees. We respect our British customers just like everyone else, but until the delivery problems are resolved, it will not be possible to order products for delivery to the UK.
We are constantly working on solving the problem, when anything changes, we will inform about it on our social media channels.
You can find our products at our distributor