The VAT registration threshold for EU business is £85,000. Below that and they don't have to register, once they do though, they'll have to do accounts for HMRC (as well as their own government) along with all the additional cost that entails. For someone like TG I can't see that the volume of sales is worth it. Gunfire will still ship to the UK because they know there's customers there but still insist on a minimum order of £135 because that's where the responsibility shifts from them to the customer. TG stopped shipping over to the UK because of UPS and the hassle that their utter clusterfuck of a service has caused them. GF just started using a different courier instead (GLS).