Currency matters. Especially for support.
When you pay in GBP, you're dealing with someone who operates in the UK economy. They pay UK server costs. They have UK bank accounts. They understand UK holidays and viewing patterns.
A British iptv reseller who charges in GBP is accountable. You can leave a review that matters to them. You can report them to UK consumer protection (theoretically).
The British iptv service I use charges in GBP. Their invoices have a UK address. Not a virtual office in Panama.
A foreign IPTV reseller UK (claiming to be UK but charging in USD or EUR) has less accountability. What are you going to do? Complain to their government? Good luck.
GBP pricing isn't a guarantee of quality. But it's a signal. It means they're committed to the UK market. They're not just a reseller who added UK channels as an afterthought.
Follow the currency. It tells you where their loyalties lie.