Can be used abroad, single-currency UnionPay cards can be used in merchants and ATMs with UnionPay logo, and VISA and MASTER cards can also be swiped at places with corresponding logos.

Although your card is a visa credit card, what are your dual-currency credit cards? Generally, it's RMB and US dollars. If these two kinds, your POS transaction in UnionPay, the transaction currency is GBP, will deduct your RMB money. If you take the visa route, the transaction currency is pound sterling, the settlement currency is US dollars, and the bill is issued in US dollars.