Since UK is leaving EU, there is a problem with any payment system, not with us. All UK residents may have issues with this. But this is not our (server) problem, it's a problem with payment systems (Piastrix, etc.)
EU banks reject payments from UK.
If anybody have these issues (paying from UK), you have to try any other alternative methods.
Generally speaking, our main payment system is Webmoney, and it is worldwide.