Fexco estimates that it will have a 12% share of the UK retail foreign exchange market with its latest British acquisition.
The Kerry based foreign exchange and corporate payments company has added London-based Thomas Exchange Global to its network.
The retail operator has 15 stores across the English capital.
It's Fexco's sixth acquisition in the UK since 2012.
It is believed the deal is valued at around £10m.
"It's the most attractive market in the world for Fx (foreign exchange) operators for three reasons," Joe Redmond, Managing Director of the Retail foreign Exchange Division in Fexco explained.
"It has high levels of inbound and outbound tourism. It's outside the eurozone and it's still a very cash orientated society."
He rejected the suggestion that there was a diminishing demand for cash by tourists who can increasingly use their bank cards to carry out transactions when abroad.
"Don't believe the fake news about the disappearance of cash, quite the opposite is true. There is more cash in circulation than ever before now. What drives behaviour of tourists is the question, can I be absolutely sure my card will work? So people still take an element of cash in their portfolio."
Joe Redmond said average transaction values were holding up quite well.
"We would never suggest taking all your holiday spend in cash but certainly carrying an element in cash is what everyone does. If you think there's 70 million outbound trips from the UK, 85% take an element of cash so it's still a very competitive business," he said.
Fexco's latest acquisition comes an interesting time with Brexit rapidly approaching. Mr Redmond said it was a risk that was well identified in advance.
"A hard Brexit could potentially have implications for us. It might dampen consumer confidence which would have a knock on effect on travel and a knock on effect on demand for our service. I think the rhetoric around a hard Brexit is softening and hopefully that will continue," he concluded.
